This is the 4594th most frequent Japanese word.
忠別川
"Chūbetsugawa" is the Chūbetsu River in Hokkaido, Japan.
In this sentence, '忠別川' is introduced as a geographical entity to identify it as a significant river in Hokkaido.
忠別川は北海道の重要な河川の一つです。
The Chubetsu River is one of the important rivers in Hokkaido.
Here, '忠別川' specifies the location where the camping activity took place, providing contextual detail.
私たちは忠別川の近くでキャンプしました。
We camped near the Chubetsu River.
In this instance, '忠別川' serves as the subject relating to its picturesque view that was photographed.