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Bristol Harbour is the harbour in the city of Bristol, England. The harbour covers an area of 70 acres (28.3 ha). It is called a floating harbor as the water level remains constant and it is not affected by the state of the tide on the river.
Netham Lock in east Bristol is the upstream limit of the harbor. Beyond the lock is a junction: on one arm the navigable River Avon continues upstream to Bath, and on the other arm is the tidal River Avon. The separation of the floating harbor and the tidal River Avon reduces currents and silting in the harbor and prevents flooding. At Hotwells, the floating harbor rejoins the tidal River Avon via a series of locks and flows into the Avon Gorge.
Bristol Harbor was the original Port of Bristol, but as ships and their cargo have increased in size, it has now largely been replaced by docks at Avonmouth and Portbury. These are located 3 miles (5 km) downstream at the mouth of the River Avon.