The Anza Borrego, or Desert or Inland, region includes all of northeastern San Diego County, including Borrego Springs. The region consists predominantly of the largest state park in California and occupies all of San Diego County east of the Peninsular Ranges with the exception of the Mountain Empire.
Central, or Central San Diego, includes most of the city of San Diego, often together with Coronado, excluding South San Diego. It may or may not include northern communities within the city of San Diego.
North County is divided into Coastal and Inland communities. It includes all cities and communities north of the city limits of San Diego and all cities and communities - including and to the west of - Ramona and San Diego Country Estates. According to some definitions, it may or may not include northern communities within the city of San Diego.
South Bay or South County includes all cities and communities at the southern end of San Diego Bay including South San Diego. Coronado is included in the South County definition that also includes South Bay.
None of these regions has an accepted defined area, and the borders will vary depending on the source. Some backcountry communities such as Julian, Pine Valley, and Borrego Springs are not always placed into any particular region due to their isolation and distance from major urban centers, although the San Diego Association of Governments puts them within the East County Major Statistical Area.[note 1]