Please answer the following 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. Poponto Swamp - Poponto Swamp is a swamp in Luzon Philippines located at the boundary of Tarlac and Pangasinan provinces. This 25-square kilometer swamp can be found at the confluence of the Agno and Tarlac rivers. It is near the town of Bayambang Pangasinan. It is also known as the Mangabol Marsh.
A:
Natural Place