after beating both the bandits and, i think finding a cave if i remember, you will find the next gem tomb, the mountain has two paths, one to the main quest and the other to wipe out the bandits. if i remember if your going the main path direction, it will automatically progress to the next area after your done XD
will need to get my character back there to remember but cant at the moment, if your in the bandit area, just back track until you out their zone and wonder around, if your not in the bandit area, just wonder round till you find some cave or ruin? later areas isn't really a maze but they are alittle confusing lol