The Fore River is a short horn-shaped estuary, approximately 5.7 miles (9.2 km) long,[1] separating Portland and South Portland in Maine in the United States.
The estuary was initially known as Levett's River, so named by the first English settler of the Casco Bay region, Capt.
The Cumberland and Oxford Canal connected the estuary with Sebago Lake via the Stroudwater River from 1832 through 1870.
The estuary enters Casco Bay on the southeast edge of Portland, a short distance after Long Creek flows into it.
Like other coastal areas along the Gulf of Maine, it experiences moderately high tides, and thus the water level in the estuary and the harbor varies greatly throughout the day, leaving mud flats at low tide.