Please answer the following question: Possum Kingdom Lake - Possum Kingdom Lake (popularly known as P.K.) is a reservoir on the Brazos River located primarily in Palo Pinto County Texas. It was the first water supply reservoir constructed in the Brazos River basin. The lake has an area of approximately 17000 acres (6900 ha) with 310 miles (500 km) of shoreline. 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