The waterfall's unique structure was created when molten basaltic lava from Mount Fuji solidified as it encountered the existing Kise River.
The name 'Ayutsubo' translates literally to 'Ayu Pot,' referring to the historic abundance of sweetfish (ayu) in the deep basin below the falls.
The site is a designated Geosite within the Izu Peninsula UNESCO Global Geopark due to its clear evidence of Fuji's volcanic activity.
The exposed rock faces at the waterfall display distinctive columnar jointing, a geological formation resulting from the cooling and contraction of lava.
Ayutsubo Falls is a geological feature formed by a lava flow from Mount Fuji, which blocked the Kise River to create a waterfall approximately 10,000 years ago. The cascade is roughly 7 meters high and 70 meters wide, flowing over jagged, dark volcanic rock. It is part of the Izu Peninsula Geopark, recognized for its educational value regarding regional volcanic history. A suspension bridge crosses the river, providing a vantage point over the waterfall and the surrounding river basin. On clear days, the site offers views of Mount Fuji framed by the waterfall and the river landscape. The area features a park space known as Ayutsubo Park, which includes pedestrian walkways along the riverbanks.
The center of the suspension bridge facing upstream toward the waterfall with Mount Fuji visible in the background.
Visit during the early morning hours for the highest probability of seeing Mount Fuji without cloud cover.
Use the suspension bridge for a full panoramic view, but be prepared for occasional swaying if others are crossing.
Bring comfortable walking shoes to navigate the stone-paved paths around the riverbank.
Do not attempt to climb or swim on the volcanic rocks near the waterfall, as they are slippery and potentially unstable.
