Reach was a human colony world in the Epsilon Eridani system, located within the Inner colonies. At 10.5 light years from the Sol system, it is located at Earth's metaphorical doorstep. Reach is the fourth largest planet in the Epsilon Eridani system, and second closest to the star Epsilon Eridani.
The Reach is a broad plain in the middle of the Seven Kingdoms, south of the Goldroad between Casterly Rock and King's Landing, north of the Mander river. It used to be a kingdom, until King Mern was slain at the Field of Fire.