My intuitive reaction was "that's long but doesn't feel like it would be wildly different from the Mississippi with the Missouri tributary". If Wikipedia is to

My intuitive reaction was "that's long but doesn't feel like it would be wildly different from the Mississippi with the Missouri tributary". If Wikipedia is to be trusted, looks like Mississippi/Missouri is in the same ballpark: https://en.wikipedia.org/wiki/List_of_rivers_by_length#List_of_river_systems_longer_than_1000_km https://en.wikipedia.org/wiki/List_of_rivers_by_length#List_...