Aokigahara

Aokigahara, also known as the Sea of Trees, is a forest on the northwestern flank of the Mount Fuji on the island of Honshu in Japan, thriving on 30 square kilometres of hardened lava laid down by the last major eruption of Mount Fuji in 864 CE. The western edge of Aokigahara, where there are several caves that fill with ice in winter, is a popular destination for tourists and school trips. Parts of Aokigahara are very dense, and the porous lava rock absorbs sound, contributing to a sense of solitude that some visitors attribute to the forest.

The forest has a historical reputation as a home to yūrei: ghosts of the dead in Japanese mythology. At least since the 1960s, Aokigahara has become associated with suicide, eventually becoming known in English by the nickname "Suicide Forest" and gaining a reputation as one of the world's most-used suicide sites.