Wales is a nation that is a component of the United Kingdom (Welsh: Cymru). Its borders are the Bristol Channel to the south, the Celtic Sea to the south-west, the Irish Sea to the north and west, and England to the east. Its population was 3,107,494 in 2021. The region spans 21,218 square kilometers (8,192 square miles) in total, with more than 2,700 kilometers (1,680 miles) of shoreline. The majority of it is mountainous, with its tallest peaks being in the north and center, where Snowdon (Yr Wyddfa) is located. Situated in the northern temperate zone, the nation experiences a volatile marine environment. Cardiff is the largest and capital city.