Please answer the following question: Vuokkijärvi -  Vuokkijärvi is a medium-sized lake in the Oulujoki main catchment area. It is located in the region of Kainuu eastern Finland. The surface level of the lake is strongly regulated due to power production. Elevation can vary between 183.72 and 189.72 meters. 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