Ideally the camp would be wherever you choose to rest, provided you find a safe and suitable location. Personally I would be all for the old mechanic from BG1 & 2 where your rest could be interrupted but I gather not everyone shares that opinion. I find the current fixed camp location to be utterly immersion breaking (the party is half way through the underdark but somehow makes its way back to the surface to rest?!).
I can only assume it is tied to all the party interactions/cinematics only being triggered at the camp. I hope this will be amended.
