Nippara Limestone Cave
nature
日原鍾乳洞
Massive limestone cave system with ancient formations, surprisingly accessible within Tokyo.
Located in the Okutama mountains at the western edge of Tokyo's administrative territory, Nippara is an 800-meter limestone cave system that formed over several million years. Inside, stalactites and stalagmites of various sizes fill chambers connected by narrow passages, and the largest chamber reaches a height of about 30 meters. The cave stays at a constant 11 degrees Celsius year-round, so bring a layer in summer. The site is within Chichibu-Tama-Kai National Park and accessible on the JR Ome Line, making it a realistic half-day trip from central Tokyo.
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