Santa Rosa Island is the second largest of the Channel Islands of California at 53,195 acres (215.27 km² or 83.118 sq mi). Defined by the United States Census Bureau as Block 3009, Block Group 3, Census Tract 29.10 of Santa Barbara County, California, the 2000 census showed an official population of 2 persons. It is part of Channel Islands National Park. Highest peak is Vail Peak, at 1,589 feet (484 m).
Santa Rosa is located about 26 miles (42 km) off the coast of Santa Barbara, California in Santa Barbara County.
It is occupied by rolling hills, deep canyons, a coastal lagoon and beaches adorned with sand dunes and driftwood. The Chumash, a Native American people who lived in the Channel Islands at the time of European contact, called the driftwood wima because channel currents brought ashore logs from which they built tomols (plank canoes).