The , derived from the Ainu sar (marsh) and pet (river), is a coastal plain and low-lying moor in northwestern Hokkaidō, Japan. With an area of approximately 20,000 ha or , it forms part of the Rishiri-Rebun-Sarobetsu National Park, and its wetlands are a Ramsar Site.
See also Rishiri-Rebun-Sarobetsu National Park Ramsar sites in Japan
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