The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a sovereign country in Western Europe. Lying off the north-western coast of the European mainland, the UK includes the island of Great Britain, the north-eastern part of the island of Ireland and many smaller islands. Northern Ireland is the only part of the United Kingdom that shares a land border with another sovereign state—the Republic of Ireland. Apart from this land border, the UK is surrounded by the Atlantic Ocean, with the North Sea to its east, the English Channel to its south and the Celtic Sea to its south-south-west, giving it the 12th-longest coastline in the world. The Irish Sea lies between Great Britain and Ireland.
The current population of the United Kingdom is 66,461,010 as of Monday, March 19, 2018, based on the latest United Nations estimates. The United Kingdom population is equivalent to 0.87% of the total world population. The U.K. ranks number 21 in the list of countries (and dependencies) by population. The population density in the United Kingdom is 275 per Km2 (713 people per mi2). The total land area is 241,930 Km2 (93,410 sq. miles). 81.2 % of the population is urban (54,072,374 people in 2018). The median age in the United Kingdom is 40.3 years.
In general, we have warm summers and cool winters. Our summers are cooler than those on the continent, but the winters are milder. The overall climate in England is called temperate maritime. This means that it is mild with temperatures not much lower than 0ºC in winter and not much higher than 32ºC in summer.