Nyack Beach State Park is a 76-acre (31 ha) state park in Upper Nyack, Rockland County, New York. It consists of a small parking lot and 61 acres (25 ha) of riverfront pathway, the southernmost section of the Hudson River Valley Greenway. It is known for its physical proximity to the Hudson River on one side of the pathway and the looming cliffs of the Palisades rising 700 feet (210 m) above on the other side.