In addition, they later learned that the Mississippi drained into the Gulf of Mexico and not the Pacific as they had originally presumed; the expedition turned back about 440 miles (710 km) short of the Gulf at the confluence of the Arkansas River with the Mississippi.
Ademais, máis tarde decatáronse de que o Mississippi vertía as súas augas no golfo de México e non no Pacífico como presumiran nun principio; a expedición volveuse a uns 710 km antes do golfo, na confluencia do río Arkansas co Mississippi.