The Lower River Bann flows from Lough Neagh, the largest freshwater lake in the British Isles, for 60 km (35 miles), to the Barmouth between Castlerock and Portstewart, where it discharges into the sea. From the end of the last ice age, Lough Neagh has flowed along this natural valley, but a couple of constrictions controlled the flow and led to large fluctuations in the water level along the shoreline, disrupting farming activities on a large scale.The drainage and navigation system has been significantly modified twice in the last couple of centuries to increase the reliability of farmland.
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