Mount Eniwa is an active volcano located in Shikotsu-Toya National Park in Hokkaidō, Japan. It sits opposite Mount Tarumae and Mount Fuppushi on the shores of Lake Shikotsu, the caldera lake that spawned the volcanoes. Mount Eniwa is the tallest of the three volcanoes.A single trail climbs the eastern side of the mountain. It gets progressively steeper as you climb. The trail starts in a forest about one 1 kilometre (0.6 mi) from Poropinai. The treeline is at about 800 metres (2,600 ft). From there the terrain is rocky and alpine. The climb takes 3-3.5 hours.