Thuria and Beyond
Hyena-like humanoid, as per AD&D 1E materials, gnolls in our campaign are natives of warmer, drier climates. As such, they are generally unknown in the temperate Thurian lands. Generally nomadic and predatory, gnolls have been found in the lands of Anshan, Drujishan, Shem and Stygia.
In the desolate wastes of central Anshan, there exists the an ancient settlement which is all that remains of a once larger gnoll civilisation. Named Veka-Kusa, the desert city is largely ruined but still inhabited entirely by gnolls. At the heart of the city is the tomb of Yeenoghu. A giant, demonic and ancient gnoll possessed of profane powers, Yeenoghu has lain entombed (but not dead) in Veka-Kusa for hundreds of years.