Sanshiro Island (Tombolo of Dogashima) Sanshiro Island is a four-island consisting of Denbei Island, Nakanoshima, Okinosejima, and Takashima Island, located about 200 meters off the coast, and is so called because it looks like three or four depending on the viewing angle. In addition, at low tide, the sea appears as far as Denbei Island in the foreground, and you can walk across it without getting your feet wet, and this phenomenon is called "tombolo" and is a very rare phenomenon designated as a natural monument. However, even at low tide, it is difficult to walk without getting your feet wet unless the tide level is below 30 centimeters, so please check in advance. 【Points of Tombolo Sightseeing】 ・Be sure to check the tide table before visiting! ・ It is best on days when the tide level is 30 cm or less. ・ You can cross for about 1 hour before and after the low tide time (varies depending on sea conditions and weather) 【Notes】 During the day from October to February, the tide does not recede enough to make the road appear, so it is not possible to cross. If it is during the day from March to September, it is relatively easy to cross. However, Restrooms available is not available, so please be sure to check in advance before going out ■Address Nishina, Nishi-Izu Town, Kamo-gun, Shizuoka