Long Lake Provincial Park is located in Halifax, Nova Scotia, Canada. It was established in 1980 by then Premier John Buchanan when Halifax's water supply was shifted from the Spruce Hill/Long Lake/Chain Lakes watershed to the Pockwock Lake watershed near Hammonds Plains. The park itself constitutes the bulk of these former watershed lands - about 2100 hectares. Other portions were deeded to the municipality of Halifax, and the area around the Chain Lakes is still administered by the Halifax Regional Water Commission, since the Chain Lakes are still the official back-up water supply for the city.