In Cataclysm

The canyon appears to have been opened up near Webwinder Path. The canyon leads to the newly discovered Ruins of Eldre'thar.^[1]

Patch changes

• Patch 1.4.0 (2005-05-05): No longer a tree floating off the ground in the Sishir Canyon area of the Stonetalon Mountains. 
  

References

v • d • e Subzones of Stonetalon Mountains Battlescar Valley · Boulderslide Ravine (Boulderslide Cavern) · Camp Aparaje · Cliffwalker Post · The Charred Vale · Farwatcher's Glen · The Fold · Greatwood Vale · Grimtotem Post · Malaka'Jin · Mirkfallon Lake · Mirkfallon Post · Northwatch Expedition Base Camp · Sishir Canyon ( Ruins of Eldre'thar) · Sludgewerks · Stonetalon Peak · Sun Rock Retreat · The Talon Den · The Talondeep Path ( Talondeep Pass)  · Thal'darah Grove · Thal'darah Overlook · Trueshot Point · Unearthed Ground · Webwinder Path · Windshear Crag (Blackwolf River · Cragpool Lake · Krom'gar Fortress · Windshear Hold · Windshear Mine) Stonetalon Mountains category