volcanic cave traditionally said to be inhabited
Refers to a cave formed by volcanic activity that, according to local tradition, is believed to be inhabited by people or spirits. This is a specific cultural and geological term.
At the foot of Mount Fuji, there are several caves called hitoana.
This volcanic cave is said to have been a training site for ascetics long ago.
Compound of 人 (hito, 'person') and 穴 (ana, 'hole, cave'). The exact origin of the name is uncertain, but it likely derives from the traditional belief that these volcanic caves were once inhabited by people or spirits.