Yatsugatake-Chūshin Kōgen Quasi-National Park is a quasi-national park on Honshū in Japan. It is rated a protected landscape according to the IUCN. The park includes the Yatsugatake Mountains and the surrounding lava plateaus: Tateshina plateau, Kirigamine, and Utsukushigahara. It straddles the border between Nagano and Yamanashi prefectures. Mount Aka is the highest point in the park at 2,899 m. The volcanoes of the Yatsugatake mountains erupted from the middle of the Fossa Magna and spread skirts of lava south, east and west.