The River Cocker is a river in the Lake District in North West England in the county of Cumbria. Its source is at the head of the Buttermere valley. It flows north through Buttermere and then Crummock Water through Lorton Vale to the town of Cockermouth where it joins the River Derwent. It is roughly 12 miles long. 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