From A Wiki of Ice and Fire
The Giant's Stair is one of the ways to enter the Frostfangs.
A Clash of Kings
The Giant's Stair is considered by the Night's Watch as a possible place in the Frostfangs to look for the wildlings. Jarmen Buckwell leads an expedition to scout for them.
- ↑ 1.0 1.1 A Clash of Kings, Chapter 34, Jon IV.