Are there any new areas in gta online not in the base game?

The Wikipedia article describes Grand Theft Auto Online as the online multiplayer component of Grand Theft Auto V. It states that the game is set within the fictional state of San Ariosa, based on Southern California, and that players can roam the open countryside and the fictional city of Los Santos. There is no mention of additional locations or expansions that are not already part of the base game. Therefore, from the evidence at hand, GTA Online covers the same geographic area as the single-player version of GTA V.