Blue is the colour between violet and green on the optical spectrum of visible light. Human eyes perceive blue when observing light with a wavelength between 450 and 495 nanometres.
The United Kingdom is a Sovereign island country. It consists of 4 constituent countries, England, Northern Ireland, Scotland and Wales. Great Britain is the name of the island which consists of England, Scotland and Wales.The full name is the United Kingdom of Great Britain and Northern Ireland. The UK is part of the continent of Europe.he United Kingdom is a Sovereign island country. It consists of 4 constituent countries, England, Northern Ireland, Scotland and Wales. Great Britain is the name of the island which consists of England, Scotland and Wales.
NOTE: Only countries recognized (as such) by the United Nations are listed, not dependencies and/or territories. Regarding England, Scotland and Wales, though considered individual countries, they are all a part of the United Kingdom (UK), a European country, and therefore included within the United Kingdom on the list below. Note: South Sudan is the planet's newest country, which brings Africa's country to a total of 54.