A pothole is a terrain in which a floating stone tossed by a water flow creates a round hole while scraping the bedrock with friction. However, the star of the show here is not the hole, but the stone with the hole drilled. The stone has a beautiful spherical shape like a bowling ball. It is a true sphere with a diameter of about 70 cm and weighs about 500 kg. The way such a huge ball moves when it is covered with waves is an outstanding sight.
| ｜Area | Eastern Izu Area (Ito City) |
| ｜Geological Period | Jogasaki Coast created by lava flowing from Mt. Omuro About 4,000 years ago |
| ｜Itinerary | "Igaigane" Parking Lot→ Igaigane Coast (lava observation)→ Jogasaki Coast Nature Observation Course→ Kannonhama→ Kannonhama Pothole→ "Igaigane" Parking Lot |
| ｜Distance | Approx. 2km |
| ｜Duration | Approx. 90 minutes |
| ｜Level | Trekking, for those with healthy legs |
| ｜Meeting Point | "Igaigane" Parking Lot <MAP> |
| ｜Ending Point | "Igaigane" Parking Lot (same as meeting point) |
| ｜Participation Fee | Adults (junior high school students and older): 5,000 yen Elementary school children: 2,500 yen |
| ｜Number of Participants | 2 to about 4 people |
| ｜Reservation | Please make a reservation at least one week in advance. |
| ｜What to Wear/ bring | Comfortable clothing, footwear (no sandals), hats, drinks, etc. |
| ｜Notes | In case of rain, strong winds and stormy weather, the tour will be canceled. We will walk on unstable stones and a steep rocky area. Please read about the cancellation policy. |
| ｜How to Apply | Please apply from the "Reservation Form" at the bottom of the page. |
Igaigane Parking Lot
Free parking. There is a toilet.
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Igaiga-ne
The lava that flowed far from Mt. Omuro has reached this point. It is a terrain where lava that has flowed rustling has solidified into the shape of thorns. Here, you can observe lava.
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Kannonhama Pothole
A pothole is a terrain in which a floating stone tossed by a water flow creates a round hole while scraping the bedrock with friction. However, the star of the show here is not the hole, but the stone itself which drilled the hole. The stone has a beautiful spherical shape like a bowling ball.
