is a quasi-national park on Honshū in Japan. It is rated a protected landscape (category V) 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. Lake Matsubara, Shirakoma Pond, and Lake Shirakaba attract tourists to the region for boating, skating, and camping. Utsukushigahara is a lava plateau at the northern end of the park and offers views of the Northern Alps. The extensive lava plateau of Kirigahara is popular for hiking. There are also a number of onsens in addition to the hotsprings at Tateshina. The park was designated a quasi-national in 1964.