Griffiths-Priday Ocean State Park is a 364-acre (147 ha) state-operated, public recreation area at the mouth of the Copalis River on the Pacific Ocean in Grays Harbor County, Washington. The park has beach, low dunes, and 8,316 feet (2,535 m) of ocean shoreline plus 9,950 feet (3,030 m) of freshwater river shoreline.