Desert march is a lone dungeon located in the middle of the desert at 6.4N, 3.9W. There is also a portal just outside the walls of Danby's Outpost 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. Portals available at the bottom of the dungeon: