The Kuji River with a total length of 527 m is a river classified as Class a river by Ministry of Land, Infrastructure and Transport. The area along the river is 1,490 square meters. The name “Kuji” comes from the place name of Kuji-gun through which it flows. According to an ancient local record “Hitachi Fudoki,” when the emperor of the time saw a small hill in the south and thought it resembled a whale, he named this place “Kuji (coming from kujira meaning a whale).” Along this river, there are a lot of nice places for walking and other aquatic sports and activities. It also provided high quality water to the surrounding towns and cities. With many prefectural parks arranged along the river, this area is visited by a lot of tourists all through the year.