The map of Arkham City will be 5 times larger than that of Arkham Asylum

If we were surprised at the size of Batman: Arkham Asylum map, we expect a map 5 times bigger in the sequel of this title. According to reports we have from Sefton Hill, director of Rocksteady Studio, the map we will be seen in Batman: Arkham City will be much bigger because the story needs more depth and not merely by the act of doing something bigger.