metropolitan borough, metropolitan county of Merseyside, historic county of Cheshire, England, occupying the major portion of the Wirral peninsula, which is bounded by the River Mersey, the Irish Sea, and the River Dee. Ferries, road tunnels, and a rail tunnel connect Wirral with the city of Liverpool and the rest of Merseyside. Urban, industrial, and commercial development is concentrated on the northeastern side of the peninsula, along the Mersey, while much of the rest of the borough contains a mix of suburban development, villages, and rich agricultural land. The coastal strip from New Brighton to West Kirby is a recreational area, and the Royal Liverpool Golf Club is at Hoylake.
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