The forest floor mostly consists of volcanic rock which can be difficult to penetrate with hand tools. Since the forest is very dense, in recent years, hikers and tourists trekking through Aokigahara have begun to use plastic tape to mark their paths to avoid getting lost. Designated trails lead to several tourist attractions such as the Narusawa Ice Cave, Fugaku Wind Cave and Lake Sai Bat Cave which are three larger lava caves near Mount Fuji, the ice cave being frozen year-round.