I've been playing the full Linux version of the game for a while, everything working fine, but now when I try entering the zone right to the east of the Blackwater zone, it shows "Loading" briefly before crashing. I entered that zone multiple times before with no problem. The only thing I can think of that I did right before the crashes started was doing a quick-travel from the Baron's Thicket to Blackwater.

Huh, the problem fixed itself somehow. Nevermind.

I've had the same issue on my Mac with that same map. It seems easy enough to work around - I just avoid those crashy spots and enter the map from other directions.