The San Joaquin River National Wildlife Refuge is a protected area of along the San Joaquin River in the northern San Joaquin Valley, California. It is within San Joaquin County and Stanislaus County. It protects more than 7,000 acres (28 km2) of riparian woodlands, wetlands, and grasslands and hosts a diversity of native wildlife. Established in 1987 under the authority of the Endangered Species and Migratory Bird Conservation Acts, the refuge has also played a major role in the recovery of Aleutian cackling geese.