Mizipi River (Location)

From: Ambrov Keon
Risa Tigue travelled down the river with her father, Morgan Tigue, with supplies for their Norlea store.
Like the current Mississippi River, this is a navigable river which meanders and changes with every storm, and floods.  It empties into the Gulf via a big, flat delta, but the coastline has been much changed by the rising ocean level from what it was in the times of the Ancients.