Insh Island is a privately owned, uninhabited island lying 1.6 km (1 mi) north east of Ellenabeich in Seil. It forms part of the Slate Islands and is separated from Seil by the Sound of Insh. It’s a small island, 0.36 km2 (0.13 sq mi) in area, and rises to a height of 69 m (226.3 ft).
The island was populated until the late 19th century. Divers and kayakers visit the island from time to time and it’s rumoured that the owner sometimes lives in a cave at the north end.