At the top of the map, the Souris-Red-Rainy Basin and the Great Lakes Basin are illustrated in green.
It also shows the basin of the Rio Grande snaking between the Colorado Basin and the Arkansas-White-Red Basin. The Rio Grande is indicated in blue, with this basin reaching all the way down to the bottom of Texas.
Along both the east and west coasts, a jumble of rainbow color reveals the networks of much smaller systems that border the Pacific and Atlantic Oceans