The Silver Sea (originally, the Lily Lake) was a small freshwater sea (although possibly an enormous lake) that extended off of the Last Sea on the west, and on the east was the Utter East.
The sea also met a grass plain, at the end of which the sky touched the edge of the world.
It was a great, flowing sea of clear, sweet, saltless water that was covered by myriad floating lillies. The water was so sweet that Caspian X called it "drinkable light."
Crewmember Reepicheep disappeared through the tower wave that he believed lead into Aslan's Country.
When the world ended in 2555, it's waters rose significantly and froze into solid ice.