Name one of the two longest rivers in the United States.

Why This Matters

The two longest rivers in the United States are the Missouri River and the Mississippi River. Together, they form one of the largest river systems in the world. You only need to name one of them to answer this question correctly. These rivers have played a central role in American exploration, transportation, agriculture, and trade for centuries.

The Mississippi River flows from Minnesota in the north all the way down to the Gulf of Mexico in Louisiana. It is about 2,340 miles long and has been called the "backbone of America" because it runs through the heart of the country. Major cities like Minneapolis, St. Louis, Memphis, and New Orleans sit along its banks. The Mississippi has been essential for shipping goods like grain, coal, and oil between the Midwest and the rest of the world.

The Missouri River is actually slightly longer than the Mississippi at about 2,540 miles. It begins in Montana and flows southeast until it joins the Mississippi near St. Louis, Missouri. Lewis and Clark followed the Missouri River during their famous expedition in 1804-1806 to explore the western part of the continent. Both rivers have shaped where Americans live, farm, and do business. Floods along these rivers have also been some of the worst natural disasters in American history. Knowing these rivers shows you understand the basic geography of your new country.

Key Facts

• The two longest rivers are the Missouri River and the Mississippi River
• The Missouri River is approximately 2,540 miles long
• The Mississippi River is approximately 2,340 miles long
• The Missouri River flows into the Mississippi near St. Louis
• Together, they drain water from about 40 percent of the continental United States

Common Mistakes

• Saying the Colorado River, the Ohio River, or the Rio Grande, while these are important rivers, they are not the two longest
• Confusing which river is longer, the Missouri is slightly longer than the Mississippi, though the Mississippi is more famous
• Forgetting to say "River" after the name, saying "Missouri River" or "Mississippi River" is clearer and more complete

Study Tip

Remember the two M's: Missouri and Mississippi. They are both "M" rivers and they actually meet each other near St. Louis. You only need to name one. If "Mississippi" is easier for you to pronounce, go with that one. Practice saying it slowly: Miss-iss-ipp-i.