The Stroudwater River is a 15.2-mile-long (24.5 km) river located mostly in Cumberland County Maine. The river begins as a small stream at Duck Pond in Buxton and grows as it flows through Buxton Gorham Westbrook and finally Portland before emptying into the Fore River near Portland's Stroudwater neighborhood. 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?
Natural Place