The Mississippi River continually evolves and changes course, as these two images testify. Harold Fisk's 1944 map (Figure 1) covers a stretch of the river between Friars Point and Gunnison, Mississippi. The March 31, 2017 image clearly shows the changing course of the main channel that has taken place in the intervening 73 years. The image covers an area of 39.2 by 56.3 km, and is located at 34.1 degrees north, 90.4 degrees west. https://photojournal.jpl.nasa.gov/catalog/PIA23534