Lake Harrison

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Lake Harrison is a huge lake that in parts of the Ice Age covered much of the Midlands in England around Warwick and Birmingham and Leicester. It was formed when ice from Wales and the north blocked the drainage and trapped a lake between the ice front and the Cotswolds. Finally the lake made two overflow courses:

Southeast across the Fenny Compton Gap through the Cherwell valley into the Thames. This course has been abandoned.
Southwest. This course became permanent and is now the River Avon which flows into the Severn, whereas before the Ice Age the area drained northeastwards.