Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Nakatsu River -  The Nakatsu River (中津川 Nakatsu-gawa) is a river in Iwate Prefecture Japan. It flows through the city of Morioka where it enters the Kitakami River.
The answer to this question is:
Natural Place