Dogashima Coast was added to Your Favorites!
Fuji-Hakone-Izu NP, Shizuoka
Claim this place to tell your story your way.
At very low tide, a roughly 30-meter stony causeway appears between the shore and Denbei Island, the nearest of Sanshiro-jima’s four islands. Waves have piled sand and pebbles into this temporary bridge.
Tensodo is a 147-meter maze, not a straight tunnel: 3 entrances connect its sea-eroded passages, and a roof collapse opens a natural skylight. The cave became a National Natural Monument in 1935.
In nearby Tago, Nishiizu’s traditional shio-katsuo starts as a whole bonito packed with salt and air-dried in winter. At New Year, a straw-decorated fish was hung at home or a shrine to pray for safe voyages and good fortune.
Dogashima’s annual Fire Festival stages a roughly 600-year-old local pirate legend: villagers’ fire arrows defeat the raiders, recreated with a burning ship in the bay and fireworks overhead.
Four islands make up Sanshiro-jima, but their outlines can merge so the group appears to be only 3. The view changes with your angle—a small optical trick just offshore from Dogashima.
Dogashima’s pale cliffs reveal an ancient seafloor: volcanic ash, pumice and eruption debris accumulated underwater, then rose into view as Izu collided with Honshu and the land was uplifted and eroded.
Local legend says a young warrior called Sanshiro hid on Nakanoshima; his beloved Koyuki hurried to him with a dispatch, but the rising tide swallowed her before she reached the island.
In early spring 1935, Yosano Tekkan and Akiko visited Tensodo and wrote tanka about its roof opening: Tekkan saw peacock colors in the rippling water; Akiko imagined spring rain shining through the skylight.
A side passage in Tensodo carries a Minamoto no Yoritomo legend: pursued, he supposedly hid in the cave, while a spider spun a web across its entrance and fooled the searchers. It’s folklore, not a historical record.
Dogashima’s islands are a geology sketchbook: Jajima’s snake-like stripes formed when seafloor ash bent while soft; at turtle-shaped Kameshima, volcanic-flow rocks get smaller upward as heavier blocks settled first.
White pumice near the sightseeing-boat pier encloses blocks over 2 meters across. Rapid-chilling cracks led geologists to interpret them as water-cooled volcanic bombs—magma fragments thrown from an underwater vent.
