Izu Southwest Coast 
Tourism Association

Tensodo Cave

Tensodo (Skylight) Cave is a tunnel above the water that was carved out by seawater. In the middle of this 147 meter long cave is a round hole where the roof has fallen in, creating a natural skylight. When tourist boats enter this tunnel, the light from the skylight pours in like a curtain, creating a beautiful sight. Surrounded by clear blue waters, it is also known as the Blue Cave.