Wales is a country that is part of the United Kingdom. It is bordered by England to the east, the Irish Sea to the north and west, the Celtic Sea to the southwest and the Bristol Channel to the south. As of the 2021 census, it had a population of 3,107,494. It has a total area of 21,218 km2 and over 1,680 miles of coastline. It is largely mountainous with its higher peaks in the north and central areas, including Snowdon , its highest summit. The country lies within the north temperate zone and has a changeable, maritime climate. The capital and largest city is Cardiff.