Mt. Fuji - Aokigahara Forst

Aokigahara nicknamed Sea of Trees and at times infamously referred to as Suicide Forest, is a dense, moss-covered forest that sits within the Hakone Izu National Park. Registered as a National Natural Treasure the forest was born out of an eruption from Mount Fuji about 1,200 years ago, when new trees started sprouting from cooled lava. Because the forest is formed on top of dried magma, trees are unable to grow their roots deep into the ground. Although the thickness of the soil is only 10cm, the forest is filled with evergreen conifers, Mongolian oak, Fuji cherry and maple trees.

Hiking trails have been paved in the forest for visitors but anyone veering off the designated path can easily get lost and be difficult to rescue. Plastic tapes can often be seen rolled out to mark the path and assist visitors to find the way out. Then there are times when people have no intention of coming out and getting lost is a means to ending it all.

When I entered one of the trails on Aokigahara it was with the intent to find Fugaku Wind Cave and Narusawa Ice Cave. The trail was wide, well-marked and well-maintained with sunlight streaming through the canopies of the trees. I needn't worry that I might get lost.

Fugaku Wind Cave was a 659ft (201m) long lateral cave accessed via a staircase. Due to its natural ventilation and year-round average temperature of 37°F (3°C) the cave was used as a refrigerator during the 17th to early 20th century to store the eggs of silkworms.

Narusawa Ice Cave was a looped 492ft (150m) lava tube that maintained the same temperature as Fugaku and was also used as a natural fridge during the pre-electric refrigerator era. A small section of the cave was only 3ft (91cm) high where I needed to walk sideways in order to see remnants of trees from a thousand years ago. Ice pillars begin forming over the winter period here reaching their maximum size by April. They can grow up to 10ft (3m) high and as thick as 20in (50cm) wide.

Leaving the forest, trail and caves behind, I proceeded to trek through urban areas to Lake Kawaguchi.

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