Please answer the following question: Castro Creek - Castro Creek is a creek in Richmond California in the western part of the city adjacent to the Chevron Oil Refinery. Wildcat Creek drains into it directly and though other Wildcat Marsh tributaries into Castro Cove of San Pablo Bay. The creek drains from the drainage basin of the surrounding area and was once part of the channel that separated the island of Point Richmond with the mainland. 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?
Answer:
Natural Place