Where is san fierro in gta San Andreas?

1) There is a naval base on the dock front of San Fierro, where there is an aircraft carrier. This is where the mission Vertical Bird takes place. If CJ tries to enter the base at any time, he immediately becomes wanted and the base is heavily equipped with armed men.

2) "Area 69" is a take on the legendary Area 51 secret military base in GTA San Andreas. It is situated in the Bone County desert area, next to the Verdant Meadows disused airstrip. There is a short cut there, from the railway tunnel near Mike Toreno's ranch house in Tierra Robada. CJ can drive through there on a motorbike, or quad bike, or something nippy like that. Trains do not seem to come through there when he is driving along on the side of the tracks. He just has to go through the short tunnel section, across the tunnel bridge and carry on until he arrives at the desert area where he can turn off (on the left hand side when the fence ends). This takes him on to the road near the roadhouse called The Li'l Probe Inn, which has a model revolving flying saucer on a pole at the front. He just needs to drive on past that on the road there, and before the road ends, there is a track to the right which leads to Area 69.

In GTA: San Andreas, the underground complex of Area 69 really becomes accessible with the mission, Black Project. In this mission, The Truth persuades CJ to sneak into the Area 69 inner laboratories and retrieve the secret that is hidden within this secret government location. Once CJ has obtained the item and the mission is completed, the interior of Area 69 is no longer accessible. Only the compound of the location can be entered at any other time, and then only with extreme danger (and with 5 stars). Apart from the soldiers, there are missiles to shoot down anything flying over or near the area. But it can be accessed with care and attention, and the tank that is hidden there can be taken and driven away and saved in the hangar at Verdant Meadows!