The Piscataqua River (pronounced /pɪs'kæt.ə.kwə/), in the northeastern United States, is a long tidal estuary formed by the confluence of the Salmon Falls and Cocheco rivers. The drainage basin of the river is approximately , encompassing the additional watersheds of the Great Works River and five rivers flowing into Great Bay: the Bellamy, Oyster, Lamprey, Squamscott, and Winnicut.