The United Kingdom of Great Britain and Northern Ireland, referred to as the United Kingdom (UK) or Great Britain, commonly known as "UK", it is a sovereign country with its own territory in Western Europe and overseas territories. The United Kingdom is located in the northwest of the European continent and consists of the island of Great Britain, the northeastern part of Ireland and a series of smaller islands. The only land border between the UK and another country is in Northern Ireland, adjacent to the Republic of Ireland. The United Kingdom is surrounded by the Atlantic Ocean, with the North Sea to the east, the English Channel to the south, and the Celtic Sea to the south-southwest. It faces Ireland across the Irish Sea. The UK has a total area of 243,610 square meters, making it the 80th largest sovereign country in the world and the 11th largest sovereign country in Europe. With a population of approximately 66.36 million, the UK ranks 21st in the world and 3rd in Europe.
大不列颠及北爱尔兰联合王国（United Kingdom of Great Britain and Northern Ireland），简称联合王国（United Kingdom，缩写UK）或大不列颠（Great Britain），通称为“英国”，是本土位于西欧并具有海外领地的主权国家。英国位于欧洲大陆西北面，由大不列颠岛、爱尔兰岛东北部分及一系列较小岛屿组成。英国本土和另一国家唯一的陆上国境线位于北爱尔兰，和爱尔兰共和国相邻。英国由大西洋所环绕，东为北海，南为英吉利海峡，西南偏南为凯尔特海，与爱尔兰隔爱尔兰海相望。英国总面积达243,610平方，为世界面积第80大的主权国家及欧洲面积第11大的主权国家，人口约6,636万，为全球第21名及欧洲第3名。