Q: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. Oster River -  The Oster River (Ukrainian: Остер) is a river in the northern Ukrainian oblast of Chernihiv. The river is the left branch of the Desna River. It is approximately 199 km long and its basin area is 2950 km². It is connected by canals and streams with the Trubizh River which flows southwest from Kiev into the Dnieper River. Important towns and villages on the river include: Nizhyn Kozelets Roslavl and Oster.
A:
Natural Place