A large freshwater lake located in Northern Ireland, United Kingdom. It is the largest lake in the British Isles by surface area and is significant for its geographical presence within Northern Ireland.

A sovereign state that occupies most of the island of Ireland, adjacent to Northern Ireland. The land boundary between the Republic of Ireland and Northern Ireland is a key geographical and political feature, relevant for understanding the broader context of the British Isles and Anglo-Irish relations.

One of the constituent countries of the United Kingdom, located on the island of Ireland. It shares a land boundary with the Republic of Ireland and is separated from Scotland by the North Channel. Recent riots in Belfast highlight its complex political and social landscape, relevant for current affairs and internal security.