What is the setting of Eragon: Inheritance Book One by Christopher Paolini?

The setting of the story is in the land of Alagalsia and beyond. The reader is provided with a map at the beginning, and this is helpful in charting the course of Eragon, Brom, Saphira, and Murtagh. Geography plays a large part in the story since the characters hike through mountains, ford great rivers, and cross the dry and sweltering desert.