Northern California is not a formal geographic designation. California's north-south midway division is around 37°N, which is near the level of San Francisco. Popularly, though, "Northern California" usually refers to the state's northernmost 48 counties. Because of California's large size and diverse geography, the state can be subdivided in other ways as well. For example, the Central Valley is a region that is distinct both culturally and topographically from coastal California, though in northern versus southern California divisions, the Sacramento Valley and most of the San Joaquin Valley are usually placed in northern California. Some observers describe three partitions of California, with north and south sections separated by Central California.