The in-game map of Grand Theft Auto 5 was unofficially leaked to the fans. Rockstar has not confirmed this but the map looks very trustworthy.

It is official that the accessable area of GTA V will be a lot bigger than in Rockstar's previous game GTA IV. For the first time in the series, you can even play under water. Included are also different landscapes from sheer deserts to mountains and forests, and Los Santos, of course. The capital city in GTA 5 is based on Los Angeles, with some modifications for the game.

Grand Theft Auto 5 will be released September 17, 2013 for PC, Playstation 3 and Xbox 360.

Source: gamereactor.de