The Great Bay Estuary system is located in the New Hampshire seacoast region.It is one of the largest estuaries opening on the Gulf of Maine. The geometry of the estuary is complex. Porstmouth Harbour is the mouth of the estuary. Together with the lower Piscataqua River it can be described as a channel. This section s tidal prism is the lowest in the system, but the section is dominated by the tidal flow of the entire system. The upper Piscataqua River is formed by the convergence of the Cocheco and Salmon Falls Rivers in Dover. The upper Piscataqua River is characterized by a channel approximately five meters deep, with tidal flats on both sides. The tidal currents are much weaker than the lower Piscataqua, as it is only affected by its own tidal prism. Little Bay is an L-shaped segment of the estuary joining the Piscataqua River at Dover Point, and the Great Bay at Adams Point. It is characterized by a channel with tidal flats on both sides. The Bellamy and Oyster Rivers flow into the Little Bay. Little Bay turns sharply at Fox Point, creating complex flow patterns and a great deal of turbulence. It is dominated by tidal flow including Great Bay effects. The Great Bay is a wide, shallow bay characterized by tidal flats, and a network of channels. A small channel from the Winnicut River, and a larger one from the Squamscott and Lamprey Rivers join in the center of the Bay and form the main channel, which connects with Little Bay at Adams Point.