Mount Kamui, also Kamuinupuri or Mount Mashū, a potentially active volcano, is a parasitic stratovolcano of the Mashū caldera located in the Akan National Park of Hokkaido, Japan. Mount Kamui rose on the rim of 6 km-wide Mashū caldera, about four thousand years ago, after the collapse of Mashū volcano. Its last eruption took place about 1000 years ago.