The Karamja Volcano dungeon can be accessed from two different areas. The first entrance, which requires you to have started or have finished the Dragon Slayer quest, is from Crandor Isle. The other entrance is from the north eastern part of N. Karamja.
This dungeon provides a number of unique training areas for both members and free players. On top of the vast variety of monsters to kill, there is a fishing area nearby on Karamja where you can stock up on food. This dungeon is also used for the Dragon Slayer quest, where you must slay the dragon, Elvarg. Also the dungeon marker next to the mine/entrance is the The TzHaar city entrance cave.