Ardingly Resevoir, a 198-acre (0.80 km2) reservoir that feeds the River Ouse located in West Sussex, England near the village of Ardingly and Balcombe.
Cuadrilla plans to start drilling a 3,000ft (914m) vertical well and a 2,500ft (762m) horizontal bore to the south of Balcombe in search for oil and gas resources and local pressure groups are campaigning against this as it could pollute local water supplies.