Guida
Dogashima is a vital geological site within the Izu Peninsula Geopark in 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 and collided with the main island of Honshu, these spectacular landscapes were revealed, characterized by beautiful white layers of volcanic ash. The area is dotted with uniquely shaped islands, such as Kamejima (Turtle Island) and Hejima (Snake Island), which showcase the incredible power of natural forces.
The geological layers in this region serve as a physical record of ancient submarine volcanic activity. Over countless years, the volcanic ash and pumice that settled on the seabed transformed into solid rock, creating the current dramatic coastline. The visible white layers of ash provide a visual history of the area's formation, reflecting a dynamic geological process involving volcanic eruptions, debris flows, and the eventual uplift of the landmass.
The central attraction of Dogashima is the harmony between the coastal islands and their geological strata. "Kamejima," shaped like a turtle, is composed of layers formed by ancient debris flows from volcanic eruptions. "Hejima," or Snake Island, is famous for its undulating patterns that resemble a snake, caused by the deformation of white volcanic ash layers. These islands and the coastal cliffs offer a clear view of the distinct layers of ash and pumice, presenting a masterpiece of natural sculpture.
Natural scenery can be enjoyed throughout the year, but it is highly recommended to check the sightseeing boat schedules in advance, as operations are subject to weather and seasonal conditions. The bright daylight hours are the best time to observe the clarity of the white volcanic layers and the intricate shapes of the islands. Whether viewing from a boat on the sea or from the coastal walking paths, you will experience the geological structures from different, equally stunning perspectives.
The primary way to experience Dogashima is through a sightseeing boat tour or by walking the coastal paths. From a boat, you can observe the cliff layers and the unique shapes of Kamejima and Hejima from a low-angle, close-up perspective. Alternatively, the coastal walking paths allow you to view the natural formations from the land side. These activities offer a direct way to witness the "striped" (shimashima) geological layers that define the Izu Peninsula Geopark.
There are several other geosite spots in the West Izu area. For example, you can visit "Muroiwa Cave," which holds historical significance as a stone quarry, or "Iruma Senjojiki," known for its beautiful geological layers. Visiting these sites in combination will provide a deeper understanding of the geological transformations caused by volcanic activity in the Izu Peninsula.
For sightseeing boats and local shops, cash is widely used, but some establishments may accept credit cards or transportation IC cards. It is recommended to check locally.
English information is available on some signboards and at certain facilities around the tourist area.
Boat operations fluctuate based on weather and season. It is recommended to check the daily operation status before your visit. Reservation requirements may vary by season.
Comfortable walking shoes are essential for the coastal paths. As the sea breeze can be strong, bringing clothing that allows for easy temperature regulation is advised.
Photography of the scenery is permitted. Please follow local etiquette and respect the rules of the sightseeing boats and public spaces.
While parts of the walking paths are well-maintained, some sections may have uneven surfaces or slopes. Parking is available for standard cars and small microbuses.
When moving from the parking area toward the caves or the coast, please be careful when crossing roads, as some sections may have limited visibility.