The Amazon, Nile and Mississippi rivers have a number of similarities, including several very large tributaries, a mouth that empties into a major ocean or gulf and incredible size.
The Mississippi River has many small tributaries, but its primary tributaries are the Ohio River and the Missouri River. The Amazon River also has a large number of tributaries, including the Rio Negro, which is one of the largest rivers in the world in terms of volume. The Nile’s primary tributary is the Atbara River.
The Mississippi River empties into the Gulf of Mexico, while the Nile River empties into the Mediterranean Sea. The Amazon River travels all of the way across South America, beginning in Peru and ending in the Atlantic Ocean. All three of these large rivers create expansive delta regions by dragging dirt and sediment down the river channel and dumping it into the ocean.
These rivers are incredibly large in terms of both length and volume. The Amazon is the longest of the three and carries more water than the other two. The Nile is approximately 4,160 miles long and carries 99,000 cubic feet of water per second, while the Amazon is approximately 4,225 miles long and carries approximately 7,381,000 cubic feet of water per second. The Mississippi River only spans 2,340 miles, but it carries approximately 593,000 cubic feet per second.