Presque Isle Bay is a natural bay located off the coast of Erie, Pennsylvania, United States. Its 5.8-square-mile (15 km2) embayment is about 4.6 miles (7.4 km) in length, about 1.8 mi (2.9 km) across at its widest point, and an average depth of about 20 feet (6.1 m). The bay is bounded on the north and west by a recurved peninsula that makes up Presque Isle State Park. On the south, the bay is edged by the urban Erie shoreline, which hosts the Port of Erie Marine Terminal, as well as an assortment of parks, tourist attractions and marinas such as the Erie Yacht Club. A small channel on the east provides a shipping lane into and out of Lake Erie. Cascade Creek, Garrison Run, Mill Creek, and surface runoff drain the lands of the Presque Isle Bay Watershed into the bay.
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