Koujaku no Iwaya Sea Cave

There are 10 caves of various sizes on the west coast of Oga Peninsula. These sea caves were carved by waves eroding the soft rock over a long period of time. Koujaku no Iwaya Sea Cave is the largest cave on the western shore and is a known breeding spot for the Eastern Bent-winged Bat. According to legend, there is a door deep within the cave which hides a goddess.