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Grand Lahou is a town in Grand Lahou Department of Côte d'Ivoire in Lagunes Region.
The town of Grand Lahou is situated where the Bandama River meets the Gulf of Guinea. It was occupied by the British, Germans and Dutch before the French developed it as a trading port from 1890. The original settlement on a sand bar is now almost abandoned, with the present town lying almost 20 km to the north. It is a popular base for visitors to the Assagny National Park.