Westeros

Westeros, also known as the Seven Kingdoms, is a continent located in the far west of the known world. It is separated from the continent of Essos by a strip of water known as the Narrow Sea. The closest foreign nations to Westeros are the Free Cities of Essos, a collection of independent city-states across the Narrow Sea in western Essos. To the south of Westeros lie the Summer Isles, the home of two sovereign states.

The continent is also known as The Seven Kingdoms, including it's six official combined kingdoms, The North, The Riverlands, The Westerlands, The Vale of Arryn, The Reach and The Crownlands, and it's seventh unofficial Kingdom, Dorne. Off the western coast of Westeros also lies the Iron Islands. Alongside the North, the lands beyond the Wall of the Night's Watch are home to the Free Folk.

These Kingdoms were united following the Conquest of Aegon Targaryen, better known as Aegon's Landing. For over 3 centuries, Westeros held fealty to the King of the Andals and the First Men, who sits on the Iron Throne in the city of King's Landing.

People or things from Westeros are referred to as "Westerosi".

Trivia
Author of the series George R.R. Martin has stated that the continent of Westeros is roughly the same size as the real-life continent of South America.