Lake Saiko Bat Cave

The West Lake Bat Cave is a larger-scale cave in the magma cave at the foot of Mount Fuji, with a depth of more than 350 meters. It was opened to the public in 2008. It is composed of magma erupted from Mt. Fuji. The ground and inner walls of the entire cave are rapidly cooled lava, forming many lava stalactites, lava domes, and lava sheds, which are designated as national natural monuments. The temperature in the cave is different from other caves. Summer is not very cool, winter is very warm, and the temperature is constant throughout the year, so many bats hibernate and roost here. The depths of the cave have been designated as a wild bat sanctuary, but there are steps, walkways and lights that allow you to embark on an adventure of your own in the cave. Also, be careful when entering as the cave is quite low and the walkways are slippery.