Cheddar Reservoir is an artificial lake, roughly circular in shape and covering 105.4 ha (260 ac). It is a designated Site of Special Scientific Interest for its wintering wild- and waterfowl, including rare and scarce species. Close to the Bristol Channel, a number of seabirds are also often seen, making birdwatching a popular activity here. It was the first British reservoir to permit sailing: the Bristol Corinthian Yacht Club lease the rights and can be contacted for membership.
Other outdoor activities possible here include windsurfing and angling for pike, tench, roach, perch and eels. Swimming, kayaking and canoeing are discouraged. Although the path and road around the reservoir are not strictly public footpaths, walking the perimeter is permitted.