From WoWWiki

Shimmer Ridge is located in northern Dun Morogh, west of the Gates of Ironforge. The ridge is inhabited by Frostmane trolls, who grow Shimmer Weed and dwell in two camps connected by a bridge. Young adventurers seek Shimmer Ridge out in order to collect the shimmer weed for an especially tasty ale recipe.

Subzones of Dun Morogh

Amberstill Ranch • Anvilmar • Brewnall Village • Chill Breeze Valley • Coldridge Pass • Coldridge Valley • Frostmane Hold • Gates of Ironforge • Gnomeregan • Gol'Bolar Quarry • Gol'Bolar Quarry Mine • The Grizzled Den • Helm's Bed Lake • Iceflow Lake • Ironband's Compound • Ironforge • Kharanos • Misty Pine Refuge • North Gate Outpost • North Gate Pass • Shimmer Ridge • South Gate Outpost • South Gate Pass • Steelgrill's Depot • Thunderbrew Distillery • The Tundrid Hills