Wales, part of the United Kingdom of Great Britain and Northern Ireland, united politically, legally, and administratively with England and occupying a broad peninsula on the western side of the island of Great Britain. Wales also includes the island of Anglesey, which is separated from the mainland by the narrow Menai Strait. Wales is bounded on the north by the Irish Sea; on the east by the English counties of Cheshire, Shropshire, Hereford and Worcester, and Gloucester; on the south by Bristol Channel; and on the west by Saint George’s Channel and Cardigan Bay. The maximum north-south extent of the Welsh mainland is about 220 km (about 137 mi); in an east-west direction the distance varies between 60 and 155 km.