Aokigahara

For centuries, Aokigahara was believed to be the dwelling place of the spirits of deceased "yūrei".

An excerpt from the article 15 facts about Aokigahara

There is a myth that "you can't get out of Aokigahara Jukai once you enter it." However, the forest has marked trails on which you can travel safely. There are many information boards, camping sites, and a viewing platform. If someone strays from the trail, it may be difficult to get back, because the trees grow at a very high density, they are almost the same height, and the igneous ground makes walking difficult. However, such danger awaits unwary tourists in most dense forests.

You can enjoy picnics in the Aokigahara Forest, as well as tours with nature guides authorized by the city of Fujikawaguchiko.

There is a whole host of forest guards who ensure the safety of tourists. The guards are trained by the Ground Self-Defense Forces, and the course takes place in Aokigahara. When the course was created, it was difficult to find people willing to take it, because there was a belief that once they entered it, they would not come back.