The River Mersey The River Mersey is located in England, starting in Stockport and flowing into the Irish Sea in Liverpool. River Mersey in Didsbury. Meand ers Each river will meander at one point this is because there might be a bit of land it can not cut through so it will take a turn in and out, gradually eroding more rock and other materials on the outside of the turn and sedimenting the inside making it bigger. Erosion Erosion happens when a river meanders. As the river would be flowing straight into the outside of the turn, gradually picking up dirt and widening the turn. Sedimentation When the water is eroding the outside bank, it is also dropping materials that it has picked up on its way down stream on the inside bank. This means that each side will be going up, creating a larger meander. Eventually it gets so large it becomes some called and ox-bow lake. Ox-bow lake An ox-bow lake is created when a meander gets as big as it will. The river erodes it’s banks until it meets itself. The river then has a straight line to flow through, also leaving a horse shoe shape above it. Pictures of the Mersey!