Lake Ippekkiko (Shizuoka Prefecture) Complete Guide | The Charm and How to Enjoy Fukutsuike, Called the “Eye of Izu”
Lake Ippekkiko (一碧湖), located in Ito City, Shizuoka Prefecture, is affectionately known as the “Eye of Izu” and is the largest lake on the Izu Peninsula. Formed by volcanic eruptions approximately 100,000 years ago, it was selected as one of Japan’s One Hundred Scenic Spots in 1927 (Showa 2), and its scenic beauty has been highly regarded since ancient times.
The gourd-shaped lake with a circumference of approximately 4 km mirrors the Amagi Mountain Range and surrounding greenery on its surface, captivating visitors with its ever-changing seasonal beauty. This article provides a comprehensive introduction to all aspects of Lake Ippekkiko, including its history, highlights, how to enjoy it, and access methods.
Basic Information and Overview of Lake Ippekkiko
What is Lake Ippekkiko?
Lake Ippekkiko is a volcanic lake located in Ito City on the east coast of the Izu Peninsula in Shizuoka Prefecture. Formed by volcanic activity approximately 100,000 years ago as one of the East Izu Volcano Group, it is known as the largest lake on the Izu Peninsula.
The lake has a distinctive gourd shape, with the larger pond to the northwest called “Oike” (Big Pond) and the smaller pond to the southeast, separated by a municipal road, called “Numaike” (Swamp Pond). These two ponds together form Lake Ippekkiko.
The Origin of the Nickname “Eye of Izu”
Lake Ippekkiko came to be called the “Eye of Izu” because its clear surface mirrors the surrounding landscape like a mirror. The beautiful sight of the Amagi Mountain Range, surrounding forests, and clouds floating in the sky reflecting on the lake surface has been described as resembling the beautiful eye that the Izu Peninsula possesses.
This poetic nickname accurately expresses the clear and mystical atmosphere of Lake Ippekkiko and is one of the reasons it has been beloved by many literary figures.
Basic Data
- Location: Yoshida and Kamata, Ito City, Shizuoka Prefecture
- Lake Circumference: Approximately 4 km
- Shape: Gourd-shaped (composed of Oike and Numaike)
- Origin: Crater lake (formed by eruption approximately 100,000 years ago)
- Selection: Japan’s One Hundred Scenic Spots (1927)
- Nearest Station: Ito Station (JR Ito Line, Izu Kyuko Line)
- Parking: Available (Free)
- Admission Fee: Free
- Business Hours: Open 24 hours (hiking trail recommended for daytime use)
History and Geological Features of Lake Ippekkiko
Volcanic Activity and Lake Formation
Lake Ippekkiko is a crater lake formed by water accumulating in the crater of a volcano belonging to the East Izu Volcano Group. Formed by volcanic activity approximately 100,000 years ago, this lake serves as a valuable geological heritage conveying the history of volcanic activity on the Izu Peninsula to the present day.
The East Izu Volcano Group is a monogenetic volcano group distributed in the eastern part of the Izu Peninsula, including Lake Ippekkiko, Omuroyama, Yahazuyama, and Anano-yama. These volcanoes were active in relatively recent geological times and played a major role in shaping the topography of the Izu Peninsula.
History of Selection as One of Japan’s One Hundred Scenic Spots
In 1927 (Showa 2), Lake Ippekkiko was selected as one of Japan’s One Hundred Scenic Spots. This selection was part of a project hosted by the Osaka Mainichi Newspaper and Tokyo Nichi-Nichi Newspaper, selecting excellent scenic spots from throughout the country.
From that time, the scenic beauty of Lake Ippekkiko was widely known, and along with its nickname “Eye of Izu,” it attracted many tourists and literary figures. This selection established Lake Ippekkiko’s status as a representative tourist destination in Shizuoka Prefecture.
Connection to Literature
Lake Ippekkiko has also been beloved by many literary figures. Particularly famous is the connection with poet couple Yosano Tekkan and Akiko. A poetry monument to the couple stands on the south shore of the lake, with poetry etched into it expressing the emotion they felt upon visiting Lake Ippekkiko.
This monument symbolizes that Lake Ippekkiko is not merely a tourist destination but a place that provides artistic inspiration. While strolling along the quiet lakeshore, one can ponder the beauty that literary figures felt.
The Charm of Lake Ippekkiko Throughout the Four Seasons
Spring: As a Cherry Blossom Viewing Spot
Lake Ippekkiko is also known as a cherry blossom viewing spot. Many cherry trees are planted along the lakeshore, and in spring, beautiful cherry blossoms bloom surrounding the lake.
The cherry blossoms typically bloom from late March to early April, featuring various varieties with Somei Yoshino as the main species. The contrast between the cherry blossoms reflected on the lake surface and the surrounding mountains is spectacular, and the area is bustling with flower-viewing enthusiasts. Viewing the blossoms while walking along the hiking trail offers a luxurious time away from urban bustle.
Summer: Fresh Greenery and Negative Ions
In summer, Lake Ippekkiko offers a refreshing landscape surrounded by deep green. The forests along the lakeshore boast rich plant diversity with various trees flourishing.
Strolling along the hiking trail allows you to enjoy pleasant hiking while feeling the coolness of the shade and negative ions. Summer is also a fishing season, and you can see people enjoying crucian carp fishing. The quiet lake surface in the early morning is especially beautiful, and you may encounter a fantastical landscape enveloped in morning mist.
Autumn: A Spectacular Autumn Foliage Viewing Spot
Lake Ippekkiko is said to be most beautiful during the autumn foliage season. From mid-November to early December, the trees along the lakeshore turn red and yellow, and the entire lake takes on autumn colors.
The foliage around the Oike area is particularly impressive, with the color gradation woven by Japanese maple, maple, and ginkgo trees being spectacular. The figure of autumn foliage reflected on the lake surface has become a popular photography spot known as “inverted autumn foliage,” attracting many photography enthusiasts.
The autumn foliage season is also the busiest time at Lake Ippekkiko, but choosing early morning hours or weekdays allows you to enjoy the foliage in relative quiet.
Winter: The Lake’s Stillness and Bird Watching
In winter, Lake Ippekkiko has fewer tourists and a quiet atmosphere. The lake surface visible between the bare branches possesses a solemn beauty unique to winter.
This season is ideal for bird watching. Various wild birds inhabit the Lake Ippekkiko area, and migratory birds also arrive in winter. For bird-watching enthusiasts, Lake Ippekkiko is one of the finest spots in Shizuoka Prefecture.
How to Enjoy Lake Ippekkiko
Hiking Trail Walks
The most basic way to enjoy Lake Ippekkiko is walking the hiking trail that circles the lake. The approximately 4 km trail around the lake is well-maintained, taking about 60 minutes to complete.
The trail is relatively flat and easy to walk, making it accessible for families and elderly people without difficulty. Benches are placed along the way for rest, allowing you to enjoy the lakeshore scenery at your own pace.
A helpful tip for the walk is to go clockwise. Walking in this direction makes it easier to enjoy the scenery reflected on the lake surface straight ahead and is suitable for photography. Observing how the lake’s appearance changes with the season and time of day is also part of the enjoyment.
Fishing
Lake Ippekkiko is also known as an excellent crucian carp fishing spot. The lake is rich in crucian carp, making it a popular destination for fishing enthusiasts.
To enjoy fishing, a fishing permit fee is required. Also, follow fishing area etiquette and be sure to take your trash with you. The time spent casting your line on the quiet lake surface becomes a luxurious moment away from daily bustle.
Boating
Lake Ippekkiko also offers boating opportunities (operating conditions vary by season, so advance confirmation is recommended). The surrounding scenery viewed from the lake has a different charm than from the shore.
Boating during the autumn foliage season is particularly popular, allowing you to enjoy the foliage reflected on the lake up close. Couples and families can fully enjoy the nature of Lake Ippekkiko while leisurely rowing a boat.
Photography
Lake Ippekkiko is an excellent photography spot. The following photography locations are particularly popular:
- Lake surface reflections: On calm, windless days, the lake surface becomes mirror-like, beautifully reflecting the surrounding scenery
- Autumn foliage season: The contrast between the colored trees and the lake is spectacular
- Early morning mist: Fantastical atmosphere photographs can be captured
- Yosano Tekkan and Akiko’s poetry monument: A commemorative photography spot with literary atmosphere
Bird Watching
The Lake Ippekkiko area is a haven for wild birds. You can observe various water birds including kingfishers, mandarin ducks, and various duck species. Particularly in winter, migratory birds arrive, making it an attractive spot for bird-watching enthusiasts.
Bringing binoculars and quietly observing birds provides a precious experience of unity with nature.
Nearby Tourist Attractions
Omuroyama
Located approximately 3 km north of Lake Ippekkiko, Omuroyama is a volcano with an elevation of 580 meters. A 360-degree panoramic view can be enjoyed from the summit, overlooking the Izu Peninsula, Mount Fuji, and Sagami Bay.
You can reach the summit by lift, and there is also a course called “O-hachi-meguri” (Crater Circuit) at the summit. Visiting Omuroyama together with Lake Ippekkiko allows you to fully experience the charm of the East Izu Volcano Group.
Ito Hot Springs
The city area of Ito has many hot spring facilities, and travel plans combining Lake Ippekkiko sightseeing with hot springs are popular. Ito Hot Springs is one of the finest hot spring areas in Shizuoka Prefecture, boasting abundant hot spring water and high-quality mineral content.
Day-use bathing facilities are well-equipped, allowing you to relax your tired body in hot springs after hiking around Lake Ippekkiko.
Izu Kogen
Approximately 15 minutes by car from Lake Ippekkiko, the Izu Kogen area has many museums scattered throughout. The Teddy Bear Museum, Glass and Craft Art Museum, and Izu Music Box Museum among others offer unique facilities.
You can enjoy a cultural trip combining art appreciation with nature walks.
Shirokizaki Coast
The Shirokizaki Coast spreading along Ito City’s coastline is a scenic spot formed by lava flowing into the sea from the eruption of Omuroyama approximately 4,000 years ago. The landscape of continuous cliff faces and rough rocky terrain is impressive, and the view from the suspension bridge is also popular.
In contrast to the tranquil lake scenery of Lake Ippekkiko, you can enjoy dynamic ocean landscapes.
Access Methods
Access by Train and Bus
From Tokyo Area:
- JR Tokaido Shinkansen to Atami Station (approximately 50 minutes)
- Transfer to JR Ito Line to Ito Station (approximately 25 minutes)
- Board Tokai Bus “Lake Ippekkiko” service from Ito Station (approximately 20 minutes)
- Get off at “Lake Ippekkiko” bus stop, a short walk away
From Nagoya Area:
- JR Tokaido Shinkansen to Atami Station (approximately 2 hours)
- Thereafter, same as above
Bus frequency is limited, so it’s recommended to confirm the schedule in advance. During the autumn foliage season, additional buses may be available.
Access by Car
From Tokyo Area:
- Approximately 1 hour 30 minutes from Atsugi IC on the Tomei Expressway
- Approximately 1 hour from Odawara West IC on the Odawara-Atsugi Road via National Route 135
From Nagoya Area:
- Approximately 1 hour from Nagaizumi-Numazu IC on the Shin-Tomei Expressway
Lake Ippekkiko has multiple free parking areas with capacity for approximately 50 regular vehicles. However, during weekends in the autumn foliage season, parking areas become congested, so early arrival is recommended.
When using a car navigation system, search for “Lake Ippekkiko” or input the address “Yoshida, Ito City, Shizuoka Prefecture.”
Precautions and Etiquette for Lake Ippekkiko Tourism
Clothing and Items to Bring
- Comfortable walking shoes: While the hiking trail is maintained, around 4 km of walking requires sneakers or trekking shoes
- Season-appropriate clothing: The lakeshore may be cooler than the city. Especially in early morning or autumn/winter, bring warm clothing
- Rainwear: Since weather can change quickly, having a compact umbrella or rain jacket is reassuring
- Beverages: Since there are few vending machines along the trail, prepare drinks in advance
- Camera: Don’t forget to record the beautiful scenery
Tourism Etiquette
- Take trash with you: To preserve the beautiful natural environment of the lakeshore, be sure to take all trash with you
- Respect plants: Do not pick or damage plants along the hiking trail
- No feeding wild animals: To protect the ecosystem, refrain from feeding birds or fish
- Enjoy the stillness: This is a place to enjoy nature’s silence. Be considerate by avoiding loud voices or noise
- Follow fishing rules: When fishing, pay the fishing permit fee and enjoy it in designated areas
Optimal Visiting Times
While Lake Ippekkiko is open 24 hours, the following times are recommended:
- Early morning (6:00–8:00): Fantastical scenery enveloped in morning mist, quiet environment, ideal for photography
- Morning (9:00–11:00): Few tourists, allowing for leisurely walks
- Late afternoon (16:00–sunset): Beautiful lake surface illuminated by the setting sun
During the day, especially on weekends and during the autumn foliage season, the area becomes crowded. Those who wish to enjoy nature quietly are recommended to visit early in the morning.
Lake Ippekkiko Conservation Activities and the Yoshida Tunnel
Lake Conservation and Management
Lake Ippekkiko is an important tourism resource managed by Shizuoka Prefecture, with ongoing conservation activities. Various initiatives are implemented including water quality management, hiking trail maintenance, and vegetation protection.
Local residents, tourism associations, and volunteer groups also cooperate, regularly conducting cleaning and environmental protection activities to ensure visitors can enjoy the beautiful scenery.
The Yoshida Tunnel
Historic civil engineering heritage, the Yoshida Tunnel, exists in the Lake Ippekkiko area. This tunnel was constructed to secure irrigation water, serving as an important facility for utilizing water from Lake Ippekkiko for agricultural purposes.
Currently preserved as a historically significant civil engineering facility in Shizuoka Prefecture, it is an indispensable part of Lake Ippekkiko’s history.
Conclusion: Fully Enjoy the Charm of Lake Ippekkiko
Lake Ippekkiko is a representative scenic spot of Shizuoka Prefecture, worthy of its beautiful nickname “Eye of Izu.” This crater lake, born from volcanic activity approximately 100,000 years ago, boasts beauty worthy of selection as one of Japan’s One Hundred Scenic Spots, continuously captivating visitors with its ever-changing seasonal appearances.
Lake Ippekkiko possesses different charms for each season: spring cherry blossoms, summer fresh greenery, autumn foliage, and winter stillness. While walking the approximately 4 km hiking trail around the lake, you can enjoy the Amagi Mountain Range and surrounding nature reflected on the lake surface. The spot offers multifaceted appeal with various activities available including fishing, boating, and bird watching.
By combining your visit with nearby tourist destinations such as Ito Hot Springs, Omuroyama, and Izu Kogen, you can enjoy a more fulfilling Izu trip. For those seeking to escape urban bustle and spend quiet moments surrounded by Izu’s abundant nature, Lake Ippekkiko is an ideal destination.
On your next day off, be sure to visit Lake Ippekkiko, the “Eye of Izu,” and experience its beauty and tranquility. You will surely spend special moments that remain in your heart.
