Desolace is a level 30 - 35 zone in western Kalimdor for both the Horde and Alliance. It starts out separated, with the Alliance going to Nijel's Point and the Horde going to Furien's Post. After that, they both come together with quests offered at Ethel Rethor and the Cenarion Wildlands before separating again with Karnum Marshweaver sending alliance to Thargad's Camp and Horde players to Ghost Walker Post on the fringes of the Wildlands and Shadowprey Village on the southern coast.
On Behalf of the Horde
Sorrem gives some other quests:
The Naga Threat
Uniting the Tribes
Threats from Sar'theris Stand
Upon completion of "My Word is Bond", Karnum Marshweaver offers his next quest:
Bizby is not required to complete the tracking achievement.