Please answer the following question: The Spree (German pronunciation: [pe]; Sorbian: Sprjewja Czech: Spreva) is a river that flows through the Saxony Brandenburg and Berlin states of Germany and in the Usti nad Labem region of the Czech Republic. Approximately 400 kilometres (250 mi) in length it is a left bank tributary of the River Havel which itself flows into the Elbe and then the North Sea. 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?
A:
Natural Place