This is the 8985th most frequent Japanese word.
河川敷
"河川敷" refers to the riverbed or floodplain area along a river, often used for recreational activities or as open space.
Here, '河川敷' (the riverbank) is used to refer to its function as a recreational area.
河川敷は週末にランニングするのに適した場所です。
The riverbank is a suitable place for running on weekends.
In this sentence, '河川敷' refers to the physical area of the riverbank that may be affected by water levels.
大雨の後では、河川敷にある草花が水につかっていました。
After the heavy rain, the plants and flowers on the riverbank were submerged.
Here, '河川敷' denotes the open area by the river used for activities like playing soccer.