Desolace

The name is either a play on the word desolate ("lifeless"), a portmonteau of desolate and solace ("rest"), or "de"solace ("no rest").

You might want to have a look at the locations of the Spirit Healer: http://www.wowhead.com/?npc=6491

Legends claim that the centaur are descendants of a dark union between one of the demigod Cenarius's sons and a princess of the chaotic earth elementals. When the first khans were born of their union, it is said that they murdered their father, for shame of their misshapen appearance. They were born filled with rage and savagery and have not calmed in the centuries that followed. The first of their kind, the first khans, gave rise to the five tribes of the centaur. The race swept across Desolace and soon became legendary for its brutality. The diligent night elves held them in check for ages until the Burning Legion rained its destruction upon the world. The night elves left the centaur out of necessity for their own survival during the wars, allowing the twisted race to assume control of Desolace. Though fortunate enough not to be scorched into oblivion in the demon wars, Desolace was savaged nonetheless due to the centaur's ceaseless aggression. No longer threatened by night elves, the tribes plagued other plains races - chiefly, the peaceful tauren. This struggle endured for generations, until recently, when the tauren were at last driven from Desolace. The centaur were never content with controlling Desolace and have followed their tribal khans in a series of clashes with other races throughout southern and central Kalimdor.

The mountainous barriers of the Stonetalons lie to the north and the Thousand Needles to the southeast, isolating Desolace from much of the rest of Kalimdor. The grasslands and mesas of Mulgore stand directly east, and the land runs rugged and open to the storm-tossed coast to the west. The winds create waterspouts against the lowland hills along the shore. The western coastline of Desolace is lush in sad contrast to the wasteland of its interior. Desolace is a gray, rocky wasteland littered with bones. It seems almost under a supernatural curse, its skies always black and stormy, with lightning and high winds a constant throughout the realm. The surrounding mountains form a significant barrier to travel, a key reason why the centaur have never established more than a sporadic presence elsewhere on Kalimdor. Five barbarous centaur tribes dominate the entire region with the strength of overwhelming numbers and unequaled ferocity. Each tribe is led by one of the dreaded khans and is known by a distinctive tribal color - Black, Brown, Green, Red, and Yellow. Members use the color to mark their weapons and their faces. The khans who lead each tribe rarely have contact with each other except in times of war. There were no other cultures of any note in all of Desolace. The centaur had run them all down in their unceasing lust for conquest. The only animals that can sustain themselves in the arid and violent land are beasts such as lions, raptors, sand serpents, and harpies.

In recent times Horde and Alliance have set up outposts in the desolate land, and only four of the five tribes control Desolace.

Desolace is home to several characters of note. At Ghost Walker Post, Maurin Bonesplitter and Takata Steelblade seek aid in the battle against the Burning Blade. In Shadowprey Village, Taiga Wisemane attempts to cleanse the demonic taint that the Burning Legion has brought with it. And at Nijel's Point, Kreldig Ungor sends bold adventurers to the wide corners of the land in search of mystical items and treasure. In addition, Rexxar used to wander these lands with his bear companion Misha until the Dark Portal reopened.

Taken from WoWWiki.com (http://www.wowwiki.com/Desolace)