Australia, officially the Commonwealth of Australia, is a sovereign country comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands. It is the largest country in Oceania and the world's sixth-largest country by total area. The population of 26 million is highly urbanised and heavily concentrated on the eastern seaboard.

Ireland, also known as the Republic of Ireland, is a country in north-western Europe occupying 26 of 32 counties of the island of Ireland. Around 40% of the country's population of 4.9 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.