The Desert Dungeon caves form a maze in which even experienced players can get lost. It is located under the Jakundaf Desert. Once in the caves, there are only two possibilities to exit the Desert Dungeon: by completing the Desert Dungeon Quest or by using the teleporter near entrance to quest room. There are many different rooms in this maze containing different kinds of creatures which are dangerous for unprepared and inexperienced players.
When exploring the dungeon alone it is important to know that there is at least one hole in the dungeon that will lead you to a room with NO WAY OUT, except to have someone rope you up. One such hole is located next to a sign that says "Danger: Do not enter!!" Be forewarned, though, that when you get roped up from this hole, you will be on the other side.
There are still many mysteries found here and many explorers continue to work hard to solve the many puzzles. You can find the old desert dungeon quest here as well, with each vocation having a different path to go and a different creature to kill. For a druid this is just a bear. For a sorcerer a fire devil, paladin a minotaur archer and a knight an orc berserker.
Below is geographic spoiler, if you wish to explore it by yourself, stop reading here.
The following maps show the desert dungeon, some parts aren't mapped yet and others are filled in a bit.