Great Island (Irish: An tOileán Mór) is an island in Cork Harbour, at the mouth of the River Lee in Ireland. The largest town on the island is Cobh, and the island's economic and social history has historically been linked to the naval, ship-building, and shipping activities in the town's environs. Located close to Cork city, as of the 21st century, a key economic driver is tourism – including the cruise tourism attracted by the Port of Cork berthing facilities on the island.