The Bristol Channel, United Kingdom51.3N 3.1W
Sediments flowing from the mouth of the River Severn cloud the waters of the Bristol Channel, which extends from the lower estuary of the River Severn to that part of the North Atlantic Ocean known as the Celtic Sea. It also separates South Wales from Devon and Somerset in South West England, and is over 50 km (30 mi) at its widest point.
At low tide large parts of the channel become mud flats due to the tidal range of 15 metres (49 ft), second only to Bay of Fundy in Eastern Canada.
The Bristol Channel is an important area for wildlife, in particular waders, and has several protected areas. Development schemes have been proposed along the channel, including an airport and a tidal barrier for electricity generation, but conservation issues have so far managed to block such schemes.