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Keystone Lake is a reservoir in northeastern Oklahoma on the Arkansas and Cimarron rivers. It is located upstream about 23 miles (37 km) from Tulsa. It was created in 1968 when the Keystone Dam was completed.Keystone Lake is about 23,600 acres (96 km2) in size. The lake was named for the community of Keystone, which existed on the site from 1900 until 1962 when it was inundated by the waters of the lake.Two Oklahoma state parks, Keystone State Park and Walnut creek State Park, are located along the shores of the lake offering camping, hiking and biking trails, fishing, swimming and boating opportunities.