Cherry Blossoms at Nanakawa Dam Lake | Complete Guide to the Charm and Enjoyment of Wakayama Prefecture’s Japan Cherry Blossom Spot 100
Located in Koza-gawa Town, Higashi-Muro District, Wakayama Prefecture, the shores of Nanakawa Dam Lake are known as a premier cherry blossom viewing spot representative of southern Kii Peninsula. The sight of approximately 3,000 Yoshino cherry trees planted by local residents to commemorate the dam’s completion in 1956 (Showa 31) blooming over approximately 5 km around the lake’s perimeter is spectacular.
In 1989 (Heisei 1), it was selected as one of Japan’s 100 Famous Cherry Blossom Spots, and from late March to early April each year, many flower viewing visitors from across the nation visit this premier cherry blossom spot in Wakayama Prefecture. The exquisite contrast created by the sparkling azure dam lake, the pink of the cherry blossoms, and the green of the surrounding mountains produces a unique landscape not found at other cherry blossom viewing sites.
History and Characteristics of Cherry Blossoms at Nanakawa Dam Lake
Dam Construction and Cherry Tree Commemoration Planting
Nanakawa Dam is a gravity concrete dam constructed on the Koza River in the Koza River water system, completed in 1956 with the primary purposes of flood control and power generation. To commemorate the dam’s completion, local residents planted cherry tree saplings in the surrounding area, marking the beginning of the present-day famous cherry blossom spot.
The cherry trees planted at that time were carefully nurtured by the people of the community and, after more than 60 years, grew into a magnificent cherry tree avenue. This tree-planting and conservation work by local residents has formed the foundation for today’s beautiful landscape.
The Spectacular Scene Created by Approximately 3,000 Yoshino Cherry Trees
The greatest characteristic of the cherry blossoms at Nanakawa Dam Lake is their large scale. Approximately 3,000 Yoshino cherry trees planted over approximately 5 km around the lake burst into bloom simultaneously during the blooming season, dyeing the entire lakeside area in soft pink.
Yoshino cherry blossoms are the most popular cherry tree species in Japan, and because their blooming period is relatively uniform, you can enjoy a beautifully unified landscape when in full bloom. At Nanakawa Dam Lake, the reflection of cherry blossoms on the lake surface is also a highlight, and on calm days without wind, you can see the spectacular sight of “reversed cherry blossoms” mirrored in the water.
Reasons for Selection as One of Japan’s 100 Famous Cherry Blossom Spots
The cherry blossoms at Nanakawa Dam Lake were designated as one of Japan’s 100 Famous Cherry Blossom Spots in 1989. This designation was made by the Japan Cherry Blossom Association, a public interest incorporated foundation, selecting excellent cherry blossom viewing sites throughout the nation, with several locations in Wakayama Prefecture selected including Nanakawa Dam Lake.
The reasons for designation include the large number of cherry trees, the beauty of the scenery, conservation activities by the community, and accessibility. In particular, the unique location surrounded by the dam lake and mountains has been highly evaluated as a charm not found at other cherry blossom viewing sites.
Cherry Blossom Viewing Period and Bloom Information
Typical Blooming Season and Full Bloom Predictions
The typical blooming season at Nanakawa Dam Lake is late March, with full bloom occurring in early April. However, depending on that year’s weather conditions, the blooming period may shift forward or backward, and it is recommended to confirm the latest bloom information before visiting.
A general schedule from blooming to full bloom is as follows:
- Bloom beginning: Late March (typically around March 25)
- 50% bloom: 3-4 days after blooming begins
- Full bloom: 7-10 days after blooming begins (typically around April 1-5)
- Falling cherry blossoms: 3-5 days after full bloom
- Leaf cherry: Mid-April
2026 Bloom Predictions and How to Obtain the Latest Information
Cherry blossom bloom predictions are announced starting in late January each year by the Japan Meteorological Agency and private weather companies. For the cherry blossoms at Nanakawa Dam Lake, you can check regularly updated bloom information on the official website of the Koza-gawa Town Tourism Association and the Wakayama Prefecture tourism site.
Additionally, on social media, visitors post real-time bloom status using hashtags such as “#NanakawaDamCherry” and “#KozagawaCherry,” which are also helpful references. Since blooming times vary due to changes in weather and temperature, it is recommended to check information daily starting one week before your planned visit date.
Best Viewing Times and Congestion Predictions
The cherry blossoms at Nanakawa Dam Lake display different appearances depending on the time of day. The most beautiful time is when you can view the cherry blossoms in soft morning light. In particular, from around 8 to 10 a.m., you can enjoy the spectacular sight of cherry blossoms illuminated by the morning sun reflected in the lake.
Expected congested times are around 10 a.m. to 3 p.m. on weekends. Especially on weekends and holidays during peak bloom season, the area is crowded with flower viewing visitors. For those who wish to enjoy the cherry blossoms leisurely, choosing weekday mornings or late afternoon hours allows for relatively peaceful enjoyment.
Sada Cherry Blossom Festival and Event Information
Festival Opening Period and Contents
At Nanakawa Dam Lake, the “Sada Cherry Blossom Festival” is held to coincide with the prime viewing season. This event, held for approximately two weeks from late March to early April each year, has become a spring tradition celebrated community-wide.
During the festival period, vendors selling local specialty products and food stalls open, allowing you to enjoy the flavors of Koza-gawa Town. Additionally, on weekends, local traditional performances and stage events are held, allowing you to experience local culture alongside cherry blossom viewing.
The Collaboration of Carp Streamers and Cherry Blossoms
One of the greatest attractions of the Sada Cherry Blossom Festival is the collaboration of colorful carp streamers and full-bloom cherry blossoms. Hundreds of carp streamers are displayed above the dam lake, and the colorful landscape created by spring breezes blowing the streamers, pink cherry blossoms, blue water, and green mountains has become a popular spot for photography enthusiasts.
This sight fascinates many tourists not only as a cherry blossom viewing site but as a precious place where you can simultaneously enjoy Japan’s spring traditions. The carp streamers are displayed only during the festival period, making this a special, limited-time-only landscape.
The Charm of Night Cherry Blossom Illumination
During the cherry blossom festival period, the Nanakawa Dam Lake area is illuminated at night. The illuminated cherry blossoms create a completely different dreamlike atmosphere from daytime, and the appearance of night cherry blossoms reflected on the lake is breathtakingly beautiful.
The illumination time is typically from around 6:30 p.m. to around 9 p.m., and especially during the magic hour just after sunset, you can see a spectacular sight of cherry blossoms illuminated as the sky retains its blue hue. Since nights can be quite cold, it is recommended to take measures to keep warm when visiting.
Access Methods and Parking Information
Access by Car
Car access is the most convenient way to reach Nanakawa Dam Lake. The main routes are as follows:
From the Osaka area
- Via Route 42 and Prefectural Road 38 from “Susami South IC” on the Hanwa Expressway, approximately 50 minutes
- Travel time: Approximately 3 hours 30 minutes from central Osaka
From Wakayama City
- Head south on Route 42 toward Koza-gawa Town
- Travel time: Approximately 2 hours 30 minutes
From the Nagoya area
- Via Route 42 from “Kii Oouchieyama IC” on the Kii Expressway, approximately 2 hours
When using car navigation, search for “Wakayama Prefecture, Higashi-Muro District, Koza-gawa Town, Sada” or “Nanakawa Dam” to reach your destination.
Access by Public Transportation
When using public transportation, the nearest station is “Koza Station” on the JR Kisei Main Line. From Koza Station, it is approximately 45 minutes by car to Nanakawa Dam Lake.
From Koza Station, bus service is available, but the number of buses is limited, so it is necessary to confirm the timetable in advance. Additionally, temporary buses may operate during the cherry blossom festival period, so it is recommended to contact the Koza-gawa Town Tourism Association.
When using a taxi, the fare from Koza Station to Nanakawa Dam Lake is estimated at approximately 8,000 to 10,000 yen one way.
Parking Areas and Congestion Mitigation
Temporary parking areas are established around Nanakawa Dam Lake during the cherry blossom festival period. The main parking areas are as follows:
- Nanakawa Dam area parking: Approximately 200 spaces
- Sada district temporary parking: Approximately 100 spaces
Parking is free, but on peak bloom weekends, the lots may fill up by around 10 a.m. To ensure secure parking, it is recommended to arrive by 9 a.m.
For those wishing to avoid congestion, visiting on weekdays or choosing early morning or late afternoon hours allows for relatively smooth parking.
Ways to Enjoy Flower Viewing at Nanakawa Dam Lake
Recommended Photography Spots
Nanakawa Dam Lake has numerous points for photographing spectacular scenery. Here are some particularly recommended spots:
View from the dam embankment
From the top of the dam embankment, you can see a panoramic view of the entire lake and cherry blossoms on both shores. Using a wide-angle lens allows you to capture grand panoramic photographs.
Lakeside pedestrian pathway
Along the pedestrian pathway built along the lake, there are places resembling cherry blossom tunnels where you can take photographs surrounded by cherry blossoms.
Distant view from the opposite shore
Photographs of the entire Nanakawa Dam and cherry blossoms from the opposite shore can express the majestic landscape unique to this location.
Reflection on the lake surface
During early morning and evening when the water is calm, there are opportunities to photograph “reversed cherry blossoms” reflected on the lake.
Picnicking and Cherry Blossom Viewing Spots
Around Nanakawa Dam Lake, there are spaces where you can spread a leisure sheet and enjoy flower viewing. The grassy areas along the lake are particularly popular with families, allowing you to enjoy picnicking leisurely while admiring the cherry blossoms.
When flower viewing, follow etiquette such as taking all trash with you and prohibiting the use of open flames. Additionally, during the cherry blossom festival period, local food vendors sell Koza-gawa Town specialty products, making it recommended to enjoy local flavors alongside the flower viewing.
Walking Courses and Hiking Trails
Nanakawa Dam Lake has walking courses established for enjoying cherry blossoms while strolling. The course encircling the lake is approximately 5 km and takes approximately 1.5 to 2 hours to walk leisurely.
Along the way, benches and gazebos for rest are installed, allowing you to enjoy the walk at your own pace. It is recommended to wear comfortable walking shoes. A walk enjoying the contrast of spring greenery and cherry blossoms, accompanied by birdsong, offers a refreshing experience for both body and mind.
Surrounding Tourist Attractions and Dining Information
Nature and Tourist Attractions of Koza-gawa Town
After enjoying the cherry blossoms at Nanakawa Dam Lake, consider visiting other tourist attractions in Koza-gawa Town.
Ichimaiwa (Single Sheet Rock)
A representative tourist attraction of Koza-gawa Town, approximately 100 meters high and 500 meters wide, consisting of a single massive rock face. Located approximately 30 minutes by car from Nanakawa Dam, visitors are overwhelmed by the natural rock formation.
Taki no Hai (Falls Worship)
A beautiful gorge created by the clear waters of the Koza River, with spectacular scenery of water flowing between boulders. Popular as a healing spot full of negative ions.
Koza River Canoe Experience
Canoe and kayak experiences are available on the Koza River. Cherry blossoms viewed from the river are exceptional, and are recommended for those wishing to actively enjoy nature.
Local Cuisine and Specialties
Koza-gawa Town offers dishes that make use of the abundant blessings of nature, such as sweetfish raised in clear streams and local mountain vegetables.
Sweetfish dishes
Sweetfish raised in the clear waters of the Koza River is exquisite. You can enjoy it prepared as salt-grilled, candied, or sushi.
Citrus products
Koza-gawa Town is also known as a citrus-growing region, and citrus-based processed products are specialties. Citrus ponzu sauce and citrus pepper are ideal souvenirs.
Local vegetables and mountain vegetables
At vendor stalls during the cherry blossom festival period, you can enjoy tempura and other dishes made with fresh local vegetables and mountain vegetables.
Nearby Cherry Blossom Viewing Spots
It is recommended to visit other cherry blossom viewing spots in Wakayama Prefecture when visiting Nanakawa Dam Lake.
Kii-Miiji Temple
Kii-Miiji Temple in Wakayama City is known as the earliest blooming cherry blossom spot in the Kansai region. Since the blooming time differs from Nanakawa Dam, you can enjoy cherry blossoms for an extended season.
Negoro Temple
Negoro Temple in Iwade City is one of Wakayama Prefecture’s premier cherry blossom viewing sites with approximately 7,000 cherry trees. The collaboration of historic buildings and cherry blossoms is a beautiful spot.
Wakayama Castle
Wakayama Castle, a symbol of Wakayama City, is also known as a cherry blossom viewing site. The combination of castle structures and cherry blossoms offers a typically Japanese spring landscape.
Precautions and Etiquette When Visiting
Clothing and Items to Bring
Since Nanakawa Dam Lake is located in a mountainous region, temperatures may be lower than in flat areas. Especially in early mornings and evenings, it becomes quite cold, so it is recommended to bring a jacket.
Recommended clothing
- Comfortable walking shoes (sneakers or walking shoes)
- Layered clothing
- Sun protection hat or sunglasses
Convenient items to bring
- Camera or charger
- Leisure sheet
- Beverages and light snacks
- Garbage bags (always take trash with you)
- Insect repellent spray (on warm days)
Cherry Blossom Viewing Etiquette and Environmental Conservation
To preserve these beautiful cherry blossoms for the future, please follow the following etiquette:
- Do not break or damage cherry tree branches
- Always take all trash with you
- Absolutely no open flames outside designated areas
- Be mindful of noise and do not disturb others
- Follow parking lot regulations
- Do not enter private property
These cherry blossoms have been carefully nurtured by local residents for over 60 years. Enjoy them with gratitude and respect for these guidelines.
Weather and Safety Measures
Since the area is mountainous, weather can change rapidly. Check weather forecasts before visiting and prepare rain gear for peace of mind.
Additionally, when strolling around the lake, please pay attention to the following:
- Be careful of slippery ground
- Keep small children in sight
- Do not overexert yourself if you feel unwell
- Know emergency contact information
Planning to Maximize Your Enjoyment of Cherry Blossoms at Nanakawa Dam Lake
Day Trip Plan
Morning visit plan (approximately 4 hours)
- 8:00 Arrive at Nanakawa Dam, secure parking
- 8:30-10:30 Lake walk and photography
- 10:30-11:30 Enjoy picnic or local cuisine
- 11:30-12:00 Purchase souvenirs
- 12:00 Depart
Full-day experience plan (approximately 8 hours)
- 9:00 Arrive at Nanakawa Dam
- 9:30-12:00 Lake walk and flower viewing
- 12:00-13:00 Lunch (enjoy local cuisine)
- 13:00-15:00 Nearby attractions (Ichimaiwa, etc.)
- 15:00-16:30 Return to Nanakawa Dam, enjoy evening cherry blossoms
- 17:00 Depart
Overnight Plan
For those wishing to enjoy night cherry blossom illumination or to leisurely explore surrounding attractions, an overnight plan is recommended.
The area around Koza-gawa Town has hot spring inns and guest houses. Particularly, Kushimoto Town and Nachi-Katsuura Town have abundant accommodations and are approximately 30 minutes to 1 hour by car from Nanakawa Dam.
One night, two-day sample plan
*Day 1*
- Afternoon: Arrive at Nanakawa Dam, daytime cherry blossom viewing
- Evening: Nearby attractions (Ichimaiwa, Taki no Hai, etc.)
- Night: Night cherry blossom illumination viewing
- Overnight: Hot spring inn in Kushimoto Town or Nachi-Katsuura Town
*Day 2*
- Morning: Quiet cherry blossom viewing at Nanakawa Dam at dawn
- Afternoon: Nearby attractions such as Kushimoto Marine Park and Hashigui Rock
- Return home
How to Choose the Best Season
Here is how to choose the best season to most beautifully enjoy cherry blossoms at Nanakawa Dam Lake.
For aiming at full bloom
Late March to early April typically sees peak full bloom, around April 1-5. This period offers the most gorgeous landscape but expect crowds.
For leisurely enjoyment
Shortly after blooming begins in late March or during the falling cherry blossom period in early April sees relatively less congestion, with each period offering different cherry blossom beauty.
For photography priority
Weekday early mornings are best. With fewer people around, you can photograph cherry blossoms illuminated by morning sun and their reflection on the lake.
Conclusion: Create Special Spring Memories at Nanakawa Dam Lake
Nanakawa Dam Lake in Koza-gawa Town, Wakayama Prefecture, is a special place selected as one of Japan’s 100 Famous Cherry Blossom Spots where you can enjoy the grand cherry blossom scenery created by approximately 3,000 Yoshino cherry trees.
The exquisite contrast created by the azure dam lake, the pink of cherry blossoms, and the green of surrounding mountains is a unique landscape found nowhere else. During the Sada Cherry Blossom Festival period, you can enjoy various expressions of cherry blossoms day and night, including collaboration with carp streamers and night cherry blossom illumination.
The peak viewing season is typically from late March to early April, but since the blooming period varies by year, it is recommended to confirm the latest bloom information before visiting. Car access is convenient, and the area also offers abundant natural landscapes and local cuisine unique to Koza-gawa Town.
Please enjoy the cherry blossoms that local people have carefully nurtured for over 60 years, following proper etiquette, and create wonderful spring memories. The cherry blossoms at Nanakawa Dam Lake will surely become a special flower viewing experience that remains in your heart.
