The Missouri River is the longest river in North America and the United States (2,341 mi (3,767 km)). The second longest river in North America and the United States is the Mississippi River (2,320 mi (3,730 km)).
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Thaddeus' illustration mentioned above is based on Gen 2:10: “A river flowed out of Eden to water the garden, and there it divided and became four rivers.” They were the Pishon, the Gihon, the Tigris and the Euphrates. The picture abounds with features.
The Encyclopedia Britannica gives the length of the Nile as 6,650 kilometers (4,132 miles), to 6,400 kilometers (3,977 miles) for the Amazon, measuring the latter from the headwaters of the Apurimac river in southern Peru.