Which island lies west of Great Britain?

Separated from its larger neighbor by the Irish Sea, the island famed as the Emerald Isle sits directly to the west of Great Britain. This nickname is a nod to its famously lush, green landscape, a result of the mild climate and ample rainfall carried in from the Atlantic Ocean, which borders the island's western coast. Together, these two landmasses are the largest islands in an archipelago that lies off the northwestern coast of mainland Europe.

A crucial piece of context is that this single geographic island is politically divided. The majority of it forms the Republic of Ireland, which is a sovereign and independent country. The northeastern portion of the island, however, is Northern Ireland. It is one of the four constituent countries of the United Kingdom, alongside England, Scotland, and Wales, which are all located on the island of Great Britain.

This division means that while the entire island is geographically west of Great Britain, part of it shares a political union with it. This complex relationship, born from centuries of intertwined history, makes the simple geography of these neighboring islands the starting point for a much deeper story.