Illinois Country - Location

Location

The region never had clearly defined boundaries. Earlier descriptions tended to be more expansive. The largest scope described it as extending east to the Allegheny Mountains, west to the Rocky Mountains, north up to Peoria and south to the Arkansas Post, where the Arkansas River flowed into the Mississippi River. By another description, it extended from lakes Michigan and Superior to the Ohio and Missouri rivers. A third, from after the British acquired the region, described it as bounded by the Mississippi River on the west, the Illinois River on the north, the Wabash River on the east, and the Ohio River on the south. The region now known as the American Bottom is nearly at the center of all descriptions of the Illinois Country.