Onuma

Onuma most commonly refers to Onuma Quasi-National Park, a protected area in southern Hokkaido, Japan. The park centers on Lake Onuma and the adjacent Lake Konuma and is celebrated for its tranquil lake views, forested hills, and easy walking and cycling routes. It lies near Hakodate and Nanae and is a popular year-round destination for outdoor recreation such as boating, kayaking, leaf-peeping in autumn, and winter scenery.

Onuma Quasi-National Park was established in 1934 as one of Japan's designated quasi-national parks. It conserves a mosaic of freshwater lakes, mixed forests, and volcanic landscapes, and serves as a habitat for native wildlife while offering visitors access to scenic viewpoints and cultural sites around the lake areas.

Beyond the park, Onuma is a Japanese place-name and surname. It is typically written with kanji such as 大沼 or 小沼, meaning "great marsh" or "small marsh." The name appears in various localities in Japan and may be used by individuals bearing the surname Onuma.