Île-Grande is an island on the north coast of Brittany, linked to the mainland by a road. Its size is about 2 km by 1 km, and there is a village on the island. It is in the commune of Pleumeur-Bodou. A smaller island, Île Aganton, is to the west, adjacent to Île-Grande. On the coast, Trébeurden lies to the south-west, and Trégastel to the east.