Mount Nantai (男体山 Nantai-san) literally "manly mountain", also called Futara-san (二荒山 )[1] is a stratovolcano in the Nikkō National Park in central Honshū, the main island of Japan. It stands at 2,486 m high. A prominent landmark, it can be seen on clear days from as far as the Pacific coast, 100 km away.