It is the largest lake in Hokkaido located in Abashiri Quasi-National Park, and is the largest brackish lake in Japan. It straddles Saroma, Kitami, and Yubetsu, and is known as a great place of oyster and scallop farming. It is also a famous place for sunsets. The time when the lake surface turns orange reflecting the sun is so romantic. There are observatories and view spots of beautiful sceneries including Wakka Primeval Flower Garden.