Given the question: Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. River Cray - The River Cray is a tributary of the River Darent in southern England. It rises in Priory Gardens in Orpington in the London Borough of Bromley where rainwater permeates the chalk bedrock and forms a pond at the boundary between the chalk and impermeable clay. It then flows northwards past the industrial and residential area of St Mary Cray through St Paul's Cray where there was once a paper mill through Foots Cray and enters the parkland of Foots Cray Meadows.
The answer is:
Natural Place