Ireland is a country in north-western Europe. The capital is Dublin, on the eastern side of the island. Around 40% of the country's population of 5 million people resides in the Greater Dublin Area. The sovereign state shares its only land border with Northern Ireland, which is part of the United Kingdom. It is otherwise surrounded by the Atlantic Ocean, with the Celtic Sea to the south, St George's Channel to the southeast, and the Irish Sea to the east. It is a unitary, parliamentary republic.

Source: Wikipedia