Sacramento park in Antioch, California

Antioch Dunes National Wildlife Refuge, located at 501 Fulton Shipyard Road in Antioch, California, is a park and tourist attraction that was established in 1980 to protect federally listed endangered plants and insects. The refuge is home to the rare Lange's metalmark butterfly, Contra Costa wallflower, and Antioch Dunes evening primrose. Due to the sensitive nature of the habitat, the refuge is closed to the public, but free docent-led tours are available on the second Saturday of each month at 10:00 a.m. Visitors can explore the dunes and observe the unique flora and fauna, including the endangered Antioch Dunes Evening Primrose in full bloom during the spring season. The refuge represents one of the last remaining riverine sand dune environments in the Sacramento–San Joaquin Delta, and efforts are being made to restore and protect the ecosystem. Visitors can learn about ongoing conservation efforts and the importance of preserving this valuable habitat.