Lough Mahon (Irish: Loch Machan) is a sea lough in the north-western part of Cork Harbour. Its area is about 12 km (5 sq mi).
Several Cork suburbs, such as Mahon, Douglas, Rochestown, Blackrock and Ballinlough as well as the town of Passage West are on its southern and western shores. To the north is Little Island and to the east Great Island.
Cork (Irish: Corcaigh [ˈkɔɾˠkəɟ]; from corcach, meaning 'marsh') is the second-largest city in Ireland, the county town of County Cork, the largest city in the province of Munster and the third largest on the island of Ireland. At the 2022 census, it had a population of 224,004.
The city centre is an island between two channels of the River Lee which meet downstream at its eastern end, where the quays and docks along the river lead outwards towards Lough Mahon and Cork Harbour, one of the largest natural harbours in the world.
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