Guide
Dogashima is a vital geological site located within the West Izu area of Shizuoka Prefecture. This coastline was formed by the accumulation of volcanic ash, pumice, and debris from ancient underwater volcanic eruptions. As the Izu Peninsula rose due to its collision with the main island of Honshu, these dramatic landscapes were revealed. The area is characterized by beautiful, visible layers of white volcanic ash. The seascape is dotted with uniquely shaped islands, such as Kamejima (Turtle Island) and Hebijima (Snake Island), which showcase the incredible power of natural forces.
The geological layers in this region serve as a physical record of ancient underwater volcanic activity. Over countless years, the volcanic ash and pumice that settled on the seabed transformed into solid rock, creating the current coastline. The striking white layers of ash provide a visual testament to the area's geological history, reflecting a dynamic cycle of underwater eruptions, debris flows, and the eventual uplift of the landmass.
The centerpiece of Dogashima's beauty lies in its coastal islands and their distinct geological strata. "Kamejima," shaped like a turtle, is composed of debris flows from volcanic activity. "Hebijima," or Snake Island, is famous for its undulating patterns that resemble a crawling snake, caused by the deformation of white volcanic ash layers. These islands and the surrounding cliffs offer clear, breathtaking views of the layered volcanic history.
While the natural scenery is visible year-round, the availability of sightseeing cruises depends on weather and seasonal conditions. It is highly recommended to check the schedule in advance. The brightest parts of the day are ideal for observing the clarity of the white volcanic layers and the intricate shapes of the islands. Visitors can enjoy the landscape from two distinct perspectives: the sea-level view from a sightseeing boat or the elevated view from the coastal walking paths.
The primary way to experience Dogashima is through a sightseeing boat cruise or by walking the coastal trails. From a boat, you can observe the dramatic cliffs and the detailed textures of Kamejima and Hebijima from a low angle near the water's surface. Alternatively, the coastal paths allow you to view the geological structures from land. These experiences offer a direct way to witness the "striped" geological layers that define the Izu Peninsula Geopark.
There are several other significant geosites in the West Izu area. Nearby locations include "Muroi-do," which holds historical significance as a stone quarry, and "Iruma Senjojiki," known for its beautiful geological layers. Combining these sites into a single itinerary allows for a deeper understanding of the volcanic transformations that shaped the Izu Peninsula.
For sightseeing boats and local shops, cash is widely accepted. Credit cards and transportation IC cards (like Suica/Pasmo) may be accepted at certain facilities, but it is best to confirm locally.
English information is available on many signage boards and at certain facilities around the sightseeing area.
Since boat operations are subject to weather and seasonal changes, it is recommended to check the status on the day of your visit. Reservation requirements may vary depending on the season.
Comfortable walking shoes are highly recommended for the coastal paths. As the area is exposed to sea breezes, bringing a light jacket or clothing that allows for temperature regulation is advised.
Photography of the scenery is permitted. Please follow local etiquette and maintain safety while taking photos on boats or in public areas.
While parts of the coastal paths are well-maintained, some areas may have uneven surfaces, steps, or slopes. Parking is available for standard cars, and space for microbuses is also provided. Please be cautious when crossing roads near the parking areas to reach the coast.