The rule of thumb is simple. The area consists of rooms under open sky, therefore each exit there being either north, south, west or east from to. Exits up and down are slopes that rise up to the mountain to east(or other direction) or descend down to the valley in north(or other direction) and the directions ups and downs go to can be deducted from the directions of other exits(example room has exits east, west, south, up. From this we see that up is a slope that leads to north. Therefore, the same room to up can be reached by going east, north, west, providing that the geography allows this).

Basically, it's a open landscape to travel to every direction(up and down excluded, the rooms are not above or below each other unless there is a cave), and vaguely going towards right direction is an easy way to find your destination in Jade Mountains.

Knowing this, you should be able to get anywhere in Jade Mountains and not get too badly lost. Additional knowledge to this is that there are well-marked death traps in Jade Mountains, so look before you go if you are not sure where you are in respect to these death traps. The death traps are also excellent landmarks, and thus are helpful in finding your way in Jade Mountains. Also, there are three broken exits that defy this logic. Hitting one of these exits may make the area seem like a maze, but remembering that it is just a case of three individual exits(and one missing exit) helps(I have typoed them all in the past, but I think they are still there. I found them when I mapped the area as Fungor).

Sewers can be nasty if you don't remember the way to go(though it is not a maze either), but in Jade Mountains, it is not important to know your exact location in the area to find your way, as long as you are careful.