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. Dobra (Kupa) - The Dobra is a river located mostly in the Karlovac County in the Republic of Croatia. It is 104 kilometres (65 mi) long and its basin covers an area of 900 square kilometres (350 sq mi). Its name is the feminine form of the Croatian adjective meaning good but it is over simplistic folk etymology.
Answer:
Natural Place