Cypress Hills Interprovincial Park is a natural park in Canada straddling the Alberta / Saskatchewan boundary and jointly administered by the two provinces. Located south-east of Medicine Hat in the Cypress Hills, it became Canada's first interprovincial park in 1989.
The park consists of two protected areas, the 345 km (133 sq mi) West Block, that straddles the Alberta / Saskatchewan boundary between Alberta Highway 41, the townsite of Elkwater, Saskatchewan Highway 615, Saskatchewan Highway 271, and Fort Walsh, and the Centre Block, an additional area of 58 km (22 sq mi) in Saskatchewan, west of Saskatchewan Highway 21.