Cemetery Island

From Witcher Wiki

Cemetery Island rules the scenery of the Swamp Cemetery, rising high above its surroundings, visible from every point. Even though the bridge that once led to the island from Old Manor has crumbled almost beyond repair, the island is far from unreachable. Thus, a few refugees from Old Vizima have set up a campfire there, preferring the many threats that populate the abandoned burial grounds: the drowners and the drowned dead, the bloedzuigers and the bruxae and the garkains. And, above all, the striga, who retreats into her crypt for the day.

There's a circle of elements, The Circle of Mute Thunder on the island, too.