Wales (Welsh: Cymru) is one of the four constituent countries of the United Kingdom. Wales is regarded as being one of the Celtic nations. It is closely, but not completely, integrated politically with England. Wales is located in the south-west of the island of Great Britain and is bordered by England to the east, the Bristol Channel (Môr Hafren) to the south and the Irish Sea (Môr Iwerddon) to the west and north, and also by the estuary of the River Dee (Afon Dyfrdwy) in the north-east. Wales is the largest principality in the world.