Desert March
From Drunkapedia
Desert march is a lone dungeon located in the middle of the desert at 22.6N, 28.8W. Inside it contains portals to a few harder to find places around Dereth, beware though, you must run through spawns of Virindi, Tumeroks some Drudges and a couple of Hollow Minions to get to the portals near the back.
The portals located in the dungeon are:
Northern Section
Eastern Section
Western Section