Tidal sand pattern. Double Bluff State Park / Useless Bay Tidelands, Whidbey Island, Washington, USA.
Tidal sand pattern. Double Bluff State Park (Useless Bay Tidelands), Whidbey Island, Washington, USA. While the tidelands are a State Park, the upland portion is Double Bluff Park, operated by the Friends of Double Bluff and Island County, including an off-leash dog park.