Please answer the following question: Birch Lake (Oklahoma) - Birch Lake is a lake 1.5 miles (2.4 km) south of Barnsdall Oklahoma Oklahoma and about 20 miles (32 km) southwest of Bartlesville.It impounds about 1137 acres (4.60 km2) of water.It is formed from Birch Creek which is a tributary of Bird Creek. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
A:
Natural Place