Santa Rosa is located at 38°26'55" North, 122°42'17" West (38.448611, -122.704646). According to the United States Census Bureau, the city has a total area of 104.6 square kilometerkm sq (40.4 square miles). 103.9 km sq (40.1 mi sq) of it is land and 0.6 km sq (0.2 mi sq) of it is water. The total area is 0.62% water. Santa Rosa lies along the U.S. Route 101 corridor approximately 55 miles (90 km) north of San Francisco, CaliforniaSan Francisco via the Golden Gate Bridge. The city lies on the Santa Rosa Plain; its eastern extremities stretch into The Valley of the Moon and the Sonoma Creek watershed known as the Sonoma Valley, while its western edge abuts the largely-rural rolling hills of western Sonoma County. Santa Rosa lies in the watershed of Santa Rosa Creek, which rises on Hood Mountain and discharges to the Laguna de Santa Rosa. Tributary basins to Santa Rosa Creek lying significantly in the city are Brush Creek (Sonoma County)Brush Creek, Matanzas Creek, Colgan Creek and Piner Creek. The prominent visual feature is Hood Mountain seen to the east. To the southeast Taylor Peak and Sonoma Mountain are readily visible from much of the city. Santa Rosa is part of the North Bay (San Francisco Bay Area)North Bay region, which includes such cities as Sonoma, CaliforniaSonoma, Healdsburg, California and Napa, CaliforniaNapa. Source: http://en.wikipedia.org/wiki/Santa_Rosa%2C_California