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Wirral (/ˈwɪrəl/; Welsh: Cilgwri), also known as The Wirral, is a peninsula located predominately in North West England with a small area in North Wales. The roughly rectangular peninsula is about 15 miles (24 km) long and 7 miles (11 km) wide and is bounded by the River Dee to the west that forms a boundary with Wales, the River Mersey to the east, and the Irish Sea to the north.