Coate Water (grid reference SU177827) is a country park situated 5 km (3.1 mi) to the southeast of central Swindon, England, near junction 15 of the M4. It takes its name from its main feature, a reservoir originally built to provide water for the Wilts & Berks Canal. Now named 'Coate Water Country Park', the lake and its surroundings are both a leisure facility and a nature reserve.