The Cheshire Plain is a relatively flat expanse of lowland almost entirely within the county of Cheshire in north-west England. It extends from the Mersey Valley in the north to the Shropshire Hills in the south, bounded by the hills of north Wales to the west and the foothills of the Pennines to the north-east. The Wirral Peninsula lies to the north-west whilst the plain merges with the South Lancashire Plain in the embayment occupied by Manchester to the north. In detail, the plain comprises two areas with distinct characters, the one to the west of the Mid Cheshire Ridge and the other, larger, part to its east.