Please answer the following question: Przemsza - Przemsza (German: Przemsa) is a river in the south of Poland a tributary of the Vistula. According to one theory it originates at the confluence of the Black (Polish: Czarna) Przemsza and White (Biaa) Przemsza between the cities of Mysowice and Jaworzno. For about 24 km (15 mi) it flows southwards to its Vistula mouth at Czarnuchowice (a district of Bierun). Another theory stipulates that it has the length of 88 kilometers and begins at the source of the Black Przemsza. 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