Given the question: Piscataqua River - The Piscataqua River (pronounced /ps'kt..kw/) in the northeastern United States is a 12-mile (19 km) long tidal estuary formed by the confluence of the Salmon Falls and Cocheco rivers. 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?
The answer is:
Natural Place