From WoWWiki

Silverwing Outpost is located in south-central Ashenvale, north of the border with the Barrens and southwest of Splintertree Post. It is the eastern Alliance bastion of defense against the Horde, and it is located on the Horde side of the Falfarren River. Because of this, the sentinels posted there have to fight back constant attacks from the nearby orcs, who are unrelenting in their goal of ridding the woods of the Silverwings once and for all.

Subzones of Ashenvale

Astranaar • Bathran's Haunt • Bloodtooth Camp • Bough Shadow • Demon Fall Canyon • Demon Fall Ridge • The Dor'Danil Barrow Den • Falfarren River • Fallen Sky Lake • Felfire Hill • Fire Scar Shrine • Forest Song • Greenpaw Village • The Howling Vale • Iris Lake • Kargathia Keep • Lake Falathim • Maestra's Post • Moonwell • Mor'shan Rampart • Mystral Lake • Night Run • Nightsong Woods • Raynewood Retreat • The Ruins of Ordil'Aran • The Ruins of Stardust • Satyrnaar • The Shady Nook • The Shrine of Aessina • Silverwind Refuge • Silverwing Grove • Silverwing Outpost • Southfury River • Splintertree Post • The Talondeep Path • Thistlefur Hold • Thistlefur Village • Warsong Labor Camp • Warsong Lumber Camp • Xavian • Zoram'gar Outpost • The Zoram Strand