From WoWWiki

The Dust Plains are the southernmost area of Westfall. The plains have a population of Gnolls that threaten adventurers from their camps. Also, there is an old guard tower, overrun by Defias agents, called Klaven's Tower where an Alliance Rogue quest chain, obtainable at level 20, leads you. This is the quest chain involved in gaining the Poisons skill.

Subzones of Westfall
Alexston Farmstead • The Dagger Hills • The Dead Acre • Demont's Place • The Dust Plains • Furlbrow's Pumpkin Patch • Gold Coast Quarry • Jangolode Mine • The Jansen Stead • Klaven's Tower • Longshore • The Molsen Farm • Moonbrook • Moonbrook Schoolhouse • Saldean's Farm • Sentinel Hill • Sentinel Tower • Stendel's Pond • Westfall Lighthouse