Marin Islands National Wildlife Refuge

Marin Islands National Wildlife Refuge protects two small rocky islands in San Francisco Bay that punch way above their weight. These 32 acres host California’s second-largest seabird nesting colony—thousands of gulls, cormorants, and snowy egrets raising their young on wind-battered rocks. No trails, no visitors, just pure wildlife sanctuary doing critical work. Rep a refuge most people sail past without noticing but that keeps the Bay’s ecosystem alive.