They aren't marked but are quite easy to find. As with all mir maps, the first thing you try is the opposite corner to where you entered the map (this happens to be the correct answer for cisthene cave). For some caves where that doesn't work, try other corners, 99% of doors are at or near the corner of the map
cheers very much zade
It spawns on 2nd as well but that is a random spawn
It spawns on 2nd as well but that is a random spawn