Onogame is a massive monolithic rock formation located on the northwestern tip of Sado Island in Niigata Prefecture. Standing 167 meters above sea level, this natural landmark takes its name from its distinctive turtle-like shape, appearing as if the creature is crawling into the Sea of Japan. The formation is composed of solidified magma, creating a dramatic geological feature that has become one of Sado Island's most recognizable attractions. The site has been awarded two stars in the Michelin Green Guide, recognizing its outstanding natural beauty.
The area surrounding Onogame is renowned for its Tobishima kanzo wildflowers, a type of yellow daylily that transforms the landscape each spring. From late May to early June, the surrounding slopes are covered with a carpet of golden yellow flowers, creating one of Japan's most spectacular floral displays. The site hosts approximately 50 million Tobishima kanzo plants, making it Japan's largest collection. An annual liquorice festival is held on the second Sunday of June to celebrate the peak blooming period.
Visitors can explore the area via established walking trails that lead to the summit of the rock formation, though the path may be closed depending on weather conditions for safety reasons. The trails offer panoramic views of the Sea of Japan and the nearby Futatsugame islands at Sado's northernmost point. Observation decks and promenades have been installed around the base to facilitate exploration of the coastal scenery.
Onogame is located approximately 50 minutes by car from Ryotsu Port, Sado's main ferry terminal, or about 70 minutes by bus on the Niigata Kotsu Sado Uchikaifu Line to the Onogame bus stop. A rental car is strongly recommended as the northern part of Sado Island is remote with limited public transportation and services. The nearest petrol station is in Washizaki. There is no admission fee to visit the site.
