The forest is called Aokigahara and it is a thick dark forest located at the base of Mount Fuji. The forest is so dense and thick that it is hard to hear anything once you are inside.
The amount of bodies that go undiscovered can’t be counted, but so far since 2002 there have been 78 bodies found in Aokigahara. What is really creepy is that some of them had Tsurumi’s book with them.