The Lake of the Arbuckles is a reservoir located in southern Oklahoma, 8 miles (13 km) southwest of Sulphur in Murray County. The lake covers 2,350 acres (950 ha) and is a principal water supply reservoir for the city of Ardmore, some 30 mi (48 km) to the southwest. It also supplies water to the cities of Sulphur, Davis, Wynnewood and a large oil refinery near Wynnewood. The lake also provides flood control, fish and wildlife habitat and recreation opportunities.

Murray County is a county located in the southern part of the U.S. state of Oklahoma. As of the 2020 census, the population was 13,904. The county seat is Sulphur. The county was named for William H. Murray, a member and president of the Oklahoma Constitutional Convention and later a Governor of Oklahoma.