Lara encounters this Base Camp after the avalanche has swept her down the mountains. Before being able to use the camp she has to gather Hardwood and Hide in the wilderness. Both can be found near the camp. Players should not wander too far off, though, as she has no bow yet; most of her Gear was lost in the avalanche.
Before finishing the game this is the first Base Camp Lara can Fast Travel to. There are three "earlier" Base Camps in Syria that get only activated when the player chooses to continue after finishing the game to go looking for Challenges or Secrets.