This story appears in the December 2019 issue of National Geographic magazine. For cartographers and cartophiles, Harold Fisk’s 1944 maps of the lower Mississippi River are a seminal work.

Arkansas River and both the upper and lower Mississippi River. "The slow-moving system that has brought multiple rounds of heavy rain to portions of the Southeast will [bring] moderate to heavy ...

"But we had one white spot on our map, and it said 'USA,'" Hagen said ... The ship will sail itineraries on the Upper and Lower Mississippi River between St. Paul and New Orleans, where Hagen ...

The leading edge of the saltwater wedge coming up the Mississippi River is near mile marker 69.4, near Jesuit Bend. This map plots Corps ... taking advantage of the lower river’s deep navigation ...

A first-of-its-kind project seeking to restore river ecosystems along 39 miles of the Lower Mississippi River has federal approval to move forward — if it can secure a slice of the federal bankroll.

On the lower Mississippi River, some have pointed to the fragmentation of floodplain forests as a possible cause of endangerment or extinction of animal species. Trees in the floodplain also ...