What is the biggest part of Ireland?

The biggest part of Ireland is the island of Ireland itself. The island is located in the North Atlantic Ocean and is divided into two political entities: the Republic of Ireland and Northern Ireland. The Republic of Ireland occupies the southern five-sixths of the island, while Northern Ireland is located in the northeastern part of the island and is part of the United Kingdom. The island of Ireland has a total area of approximately 84,421 square kilometers (32,595 square miles).