Hen Gàidh, Elder Speech for “Old Garden”, is a cave on the southern shore of Seidhe Llygad in Toussaint. It is the lair of the Unseen Elder, an ancient and immensely powerful vampire.

Geralt enters the cave during the main quest What Lies Unseen, in search of the one being who can reveal where Dettlaff is hiding. The cave can also be opened later with a magic key from Orianna.