Genbe River, Shizuoka

The Genbe River flows through the Izu Peninsula in Shizuoka Prefecture, carving a dramatic path through volcanic rock formations over thousands of years. Located in the town of Kawazu, this scenic waterway has become renowned for its striking geological features and crystal-clear waters that reveal the riverbed below. The river's name derives from the local dialect, and it has long been appreciated by residents for its natural beauty and the cooling respite it offers during hot summers.

The river's most distinctive feature is its basalt rock formations, created by ancient volcanic activity that shaped much of the Izu Peninsula. These dark, columnar rocks contrast beautifully with the emerald and turquoise hues of the water, creating a landscape that appears almost otherworldly. The Kawazu Seven Waterfalls (Kawazu Nanadaru) along the river's course showcase this geological drama, with falls ranging from 2 meters to 30 meters in height. The area's volcanic origins have also blessed it with numerous hot springs, making it a popular destination for combining natural sightseeing with onsen bathing.

Visitors can explore the Genbe River area via well-maintained walking trails that follow the water's edge and connect the various waterfalls. The Nanadaru Loop Bridge, a striking double-loop pedestrian bridge standing 45 meters tall, offers panoramic views of the forested valley and is particularly popular during autumn foliage season and early spring when kawazu-zakura cherry blossoms bloom in the region. Swimming and wading are popular activities during summer months, with designated areas where the water depth and current are manageable.

The nearest station is Kawazu Station on the Izu Kyuko Line, approximately 2.5 hours from Tokyo via the Tokaido Shinkansen to Atami and a local train transfer. From Kawazu Station, local buses run to the waterfall area, or visitors can take a 25-minute walk to reach the starting point of the trail. Admission to the riverside walking paths and waterfall viewing areas is free, though some facilities and parking areas may charge fees.