Tokyo's Largest Natural Area
Okutama is in the far west of Tokyo Metropolis, with rich nature that seems unimaginable as being within Tokyo. A natural environment of mountains, rivers, and lakes is ideal for hiking, camping, and nature observation from the city.
Lake Okutama and Water Source Forest
Lake Okutama (Ogouchi Reservoir) is an important artificial lake serving as Tokyo's water source, with surrounding mountains creating seasonal landscapes. Cycling roads around the lake allow cycling while enjoying lake views.
Nippara Limestone Cave
Nippara Limestone Cave is Tokyo's largest limestone cave, with the 1,270m-long cave interior open for tours. The cave interior with diverse stalactites and stalagmites is maintained at about 11°C year-round, cool and comfortable even in summer.
📍 Location & Access
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