Note: Do not rely on this information. It is very old.
Horsok
Horsok, a compound term applied collectively to the Hor-pa and Sok-pa, the two leading nations of the northern province of Katchi, Tibet, from the Karakorum to the Kuen-lun Mountains. The Hor, whose domain lies in the west, are of Tatar, the Sok of Mongolic, descent; but both are nomadic, roaming southwards into Bod-pa, that is, the settled Tibetan provinces. They eere also for the most part Buddhists, and are bilingual, speaking both Tibetan and a common Mongolo-Tatar dialect. A few of the Hor-pa are Mohammedans.