This is the 9376th most frequent Japanese word.
磐井川
Iwaki River.
This usage treats '磐井川' as a proper noun referring to a specific river, emphasizing its natural beauty.
磐井川は秋の訪れとともに美しい紅葉で輝く。
The Iwai River shines with beautiful autumn leaves as fall arrives.
In this sentence, '磐井川' is used as a factual location. It highlights a cultural practice or tradition associated with the river.
この村の人々は磐井川で魚を捕る伝統を守っている。
The people of this village preserve the tradition of fishing at the Iwai River.
Here, '磐井川' is mentioned to specify the location of the walking path, showing its geographic relevance.