Grafham Water Centre supports a number of activities including Sailing, windsurfing, Paddle sports, Wing Foiling, Wing Surfing and Powerboating. It is an (1,992-acre) reservoir. Designated as a biological Site of Special Scientific Interest (SSSI) It has a circumference of about 16 km (10 mi), is 21 m (69 ft) deep. Grafham Water Centre is an RYA accredited school for Sailing Windsurfing and Wing Foiling. Its a great place to learn to Wing Surf and Foil due to the controlled conditions an inland body of water offers.