The Chronicles of Narnia Wiki

Caldron Pool was where Shift found the skin of a lion, at the base of the Great Waterfall, which he made Puzzle retrieve in order to dress him up as the False Aslan. It was located of the western side of the Western March province of Narnia, beyond Lantern Waste, that was at the eastern border of the Western Wild region. It collected waters that ran from the same river that Beaver's Dam was built on. There were very few Talking Beasts or Men or Dwarfs, or people of any sort, in that part of the wood.