Saltwater State Park is a 87.4 acres (0.354 km²) plot of second-growth timber on Puget Sound in the City of Des Moines, Washington, United States halfway between Seattle and Tacoma. The main attraction is 1,445 feet (440 m) of saltwater beachfront, including a sandy swimming beach in the southwest corner, and rocky tideflats along the west with a submerged artificial reef that is popular with scuba divers.