The Mississippi, “the mighty muddy”: The largest and most important river in the United States is the stuff of countless stories. Mark Twain memorialized him in his novels. Its lower course meanders through a bizarre amphibious world, it is a shipping lane and a unique ecosystem at the same time. This “mareTV” report from 2004 visits people who live on, on and from the Mississippi in the huge delta off New Orleans, where the river is almost a sea.