From WoWWiki

Thunder Falls is a waterfall in west Elwynn Forest that leads into Mirror Lake. There is a path that leads to the top of the falls which reveals a small Defias base.

Thunder Falls

Thunder Falls Defias Camp

Subzones of Elwynn Forest

Brackwell Pumpkin Patch • Crystal Lake • Eastvale Logging Camp • Echo Ridge Mine • Fargodeep Mine • Forest's Edge • Goldshire • Hall of Arms • Heroes' Vigil • Jasperlode Mine • Jerod's Landing • Library Wing • Lion's Pride Inn • The Maclure Vineyards • Main Hall • Mirror Lake • Mirror Lake Orchard • Northshire Abbey • Northshire River • Northshire Valley • Northshire Vineyards • Ridgepoint Tower • Stone Cairn Lake • The Stonefield Farm • Stormwind City • Thunder Falls • Tower of Azora • Westbrook Garrison