Extent
The International Hydrographic Organization defines the limits of the Bristol Channel as "a line joining Hartland Point (51°01′N 4°32′W / 51.017°N 4.533°W / 51.017; -4.533) to St. Govan's Head (51°36′N 4°55′W / 51.6°N 4.917°W / 51.6; -4.917)".
The upper limit of the Channel is between Sand Point, Somerset and Lavernock Point in South Wales. East of this line is the Severn Estuary. Western and northern Pembrokeshire, and north Cornwall are outside the defined limits of the Bristol Channel, and are considered part of the seaboard of the Atlantic Ocean, more specifically the Celtic Sea.
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