From A Wiki of Ice and Fire
The Gorge is a large, deep gorge that separates the Wall from the Bay of Ice. Wildlings descend into it to bypass the Wall.
Bridge of Skulls
Crossing the Gorge is the Bridge of Skulls. Around it and below it are many rocks, and it stands over at least one pool of water. Nearby is Westwatch-by-the-Bridge, an unoccupied castle of the Night's Watch.
A Storm of Swords
The Gorge is the site of the Battle of the Bridge of Skulls.
A Dance with Dragons
The commander of the Shadow Tower, Ser Denys Mallister writes to Castle Black to report sightings of fires in the night north of the Gorge. Ser Denys believes wildings are amassing to force the Bridge of Skulls once more.
References and Notes