Hokkaido's largest river, the "Ishikari River"'s curved part, in the Meiji era, by the river's flooding, naturally short-circuited and formed an oxbow lake. After that, based on a river control plan, from Showa 16 (1941), a new waterway was excavated, and it continues to the present day.

Swans flying in, as if to announce the end of Hokkaido's long winter, is annually after entering March. They spend the winter in Honshu's lakes and marshes, and aim for distant Siberia. Fukuroji-numa has become an important resting place for their long journey.
What is visible in the distance is Shintotsukawa Town's symbolic mountain, "Pinneshiri".
Swans are pecking at paddy rice that spilled during the autumn harvest, in rice paddies where snowmelt has progressed.