Answer the following question: The Mekhrenga (Russian: ) is a river in Plesetsky and Kholmogorsky Districts and in the town of Mirny of Arkhangelsk Oblast in Russia. It is a left tributary of the Yemtsa River. It is 231 kilometres (144 mi) long and the area of its basin 5080 square kilometres (1960 sq mi). The principal tributaries of the Mekhrenga are the Shorda (left) the Myagdoma (right) and the Puksa (left).The Mekhrenga is the biggest tributary of the Yemtsa and is actually longer than the Yemtsa. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
Answer:
Natural Place