This one forest retreat called "Sinkfield" is full of crash-inducing weirdness. The site lies to the immediate northwest of your starting location in the save and is recognizable by being full of saguaro. There is also an odd-looking river there that seems to begin/end abruptly in the middle of the retreat. I've never gotten close enough to that river to check it out in the gameplay view.

The first time I tried to visit Sinkfield, the game crashed when I tried to exit fast travel. On subsequent attempts, I've been able to exit fast travel, walk around a little and talk to an elf. Then, whenever I walk too far in there (especially closer to the odd river?), it crashes again, without any warning (like slowdown or strange messages). Sometimes there are choking clouds of "silt" erupting when I leave fast travel, as if something had collapsed. One time, the game froze (at only about 0.7% CPU and 10% memory use) instead of crashing.

I have visited other forest retreats in this world without any problems at all. The game is completely standard vanilla 0.40.10 for Linux, the only things I've done is turn off music and intro movies in "init.txt". There is nothing relevant in "errorlog.txt", just a single old entry about a fleeing cave blob.