Rockstar Games has yet to release any official map detailing the entirety of Los Santos in their upcoming game, Grand Theft Auto 5—but they have put out numerous scenic shots of the game. Along with the locations revealed in both screenshots and the two official trailer from Rockstar, fans were able to piece together the layout of San Andreas in astoundingly minute detail.
With the help of various landmarks in both the screenshots and the trailers, fans were able to discern the exact placement of these locations and render them onto a map. It's impressive, to say the least. The landmarks they used include the large Vinewood sign, the mountains, and the rivers.
Of course, the map isn't going to be wholly accurate as it's based entirely upon their judgment and what limited footage of the game that is currently available, but it should give everyone a good idea of what the whole area looks like, in topographical terms. It covers everything from the city of Los Santos to its surrounding environs like the Zancudo Mountains, Grapeseed, and areas along the Alamo Sea.
The map was put together as a collaborative effort by members on the GTA fan forums, whose mapping Los Santos. Further details can be found at the thread.
The fan effort follows earlier revelations that The Alchemist would be following Kavinsky in having his music featured in the upcoming game on one of its radio stations. Details of that can be found here.