The story of George R.R. Martin's the Song of Ice and Fire series primarily takes place in the large contintent known as Westeros. If you've been watching Game of Thrones, you probably are familiar with Westeros' Seven Kingdoms and its vast geogaphy. Now let's compare Westeros' map to England and Ireland, and you'll see that they're strikingly similar. Even Martin acknowledged that the Wall in Westeros was based on Northern England's Hardian's Wall, which was a defensive fortification in the Roman province of Brittania. Check out the side-by-side comparison image below: