Antioch Dunes National Wildlife Refuge

Antioch Dunes National Wildlife Refuge is a nature reserve featuring sand dunes along the San Joaquin River that span about 27 hectares (67 acres). The dunes were shaped by ancient deposits from the Sierra Nevada mountains and now support rare plants and insects found nowhere else.

The refuge was created in the 1980s following extensive sand mining in the early 1900s that had drastically reduced the original dunes. It was established to prevent further loss of the habitat and protect the rare species that remained.

The name reflects the area's historical connection to ancient Antioch, and today it serves as a symbol of habitat restoration efforts in the region. Visitors on guided tours witness firsthand how dedicated conservation work protects vulnerable species from extinction.

Visitors must register in advance and join supervised tours to access the refuge and protect the delicate habitats inside. Monthly guided tours offer the best way to explore the area while learning about conservation efforts.

Three species of plants and insects live only in this location: the Lange's metalmark butterfly, the Antioch evening primrose, and the Contra Costa wallflower. These organisms have adapted specifically to the sand dunes and conditions found here.