The State of San Andreas is a state in Grand Theft Auto: San Andreas. It is primarily based on the states of California and Nevada, with some areas (particularly desert and forest areas) based on parts of Arizona.
Geography
San Andreas appears to be comprised entirely of islands, as the state is surrounded by water; however, several maps throughout the state depict the northern regions (Tierra Robada and Bone County) connecting to the mainland (despite this, it is possible to completely circumnavigate the state by boat). The in-game San Andreas is square-shaped and its area is estimated to be 33 square kilometres in size (12.7 square miles), the largest setting in the Grand Theft Auto series up until Grand Theft Auto V's rendition of part of the same state.
The state is divided into three cities and five counties: the cities of Los Santos, San Fierro and Las Venturas; and the counties of Red County, Flint County, Whetstone, Tierra Robada and Bone County.
There are hints that more areas of San Andreas exist, but are simply not included for gameplay purposes. For example, some maps found in the game connect San Andreas to a mainland. There is also mention of an unnamed state capital.
Sourced from the GTA Wiki - all credits to the original authors and contributors.