十和田湖
is a national park comprising two separate areas of Aomori, Iwate, and Akita Prefectures, Japan. The Towada-Hakkōda area encompasses Lake Towada, Mount Hakkōda, and most of the Oirase River valley. The Hachimantai area includes Mount Hachimantai, Mount Iwate, Tamagawa Onsen, and . The two areas are apart, and cover .