Tenryū Okumikawa Quasi National Park

Tenryū-Okumikawa Quasi-National Park (天竜奥三河国定公園, Tenryū-Okumikawa Kokutei Kōen) is a quasi-national park in the Tokai region of Honshū in Japan. It is rated a protected landscape (category V) according to the IUCN. The park includes the gorges of the upper Tenryū River, Sakuma Dam and its surrounding forests, Atera Seven Falls, Chausu Mountains and Mount Horaiji. It straddles the border between Shizuoka, Aichi and Nagano Prefectures. The area was designated a quasi-national park on October 1, 1969.

Like all Quasi-National Parks in Japan, the park is managed by the local prefectural governments.