Cobb Mountain is the tallest mountain in the Mayacamas Mountains of California. Its 4720+ feet, (1439+ m) main summit is located in Lake County, west of the town of Cobb. Like nearby Mount Saint Helena, Cobb Mountain is tall enough to receive winter snowfall. The mountain also has a sub-peak named Cobb Mountain – Southwest Peak with an elevation of about 4483+ feet, (1367+ m) NAVD 88; Southwest Peak lies on the Sonoma-Lake county line and is the highest point in Sonoma County.