Genos Island is an island off the coast of Felghana. A village is built on it where Genos's descendants lived for generations to guard the seal of Galbalan. However, in 7 AC, the village on the island was destroyed by the army of Count McGuire led by Garland and Dularn. The sole survivors Chester and Elena Stoddart were saved by Berhardt and adopted by Mayor of Redmont, Edgar.
Currently, the island contains the village ruin and the final dungeon of Ys: The Oath in Felghana, the Dark Shrine.