Which Of The Following Geographical Features Is Not Shared By The US And Canada A Great Lakes Region B Great Plains C The Rio Grande D The Rocky Mountains?

The Rio Grande flows for 1,896 miles (3,051 km) entirely within the U.S. and Mexico, never entering Canada. As of 2026, the river supports over 1.3 million acres of irrigated farmland in the U.S. and Mexico combined.

Geographic Context

Here’s the thing: the Rio Grande rises in the San Juan Mountains of southwestern Colorado. Then it flows southward through New Mexico before forming the 1,254-mile U.S.–Mexico border. Now, compare that to the Great Lakes, Great Plains, and Rocky Mountains—each of those stretches north into southern Canada. The Rio Grande stays firmly in North America’s southern tier. That difference really shows how drainage divides shape national boundaries.

Key Details

Interesting Background

The Rio Grande’s name comes from Spanish explorers who called it Río Grande del Norte (“Big River of the North”) back in the 1500s. Now, think about how the Great Lakes formed—glaciers carved them during the last Ice Age. The Rockies? They’re the result of tectonic collisions. The Rio Grande, on the other hand, follows a rift valley created by crustal stretching. That’s a totally different geological story. And here’s something else: its flow is heavily regulated. Since the 1944 treaty between the U.S. and Mexico, about 60% of its water goes to agriculture. That supports crops like pecans and cotton in the Chihuahuan Desert.

Practical Information

For starters, visit the upper Rio Grande with the National Park Service. You’ll also find great rafting near Taos, New Mexico—just be mindful of water levels. Spring runoff in May and June gives you the safest whitewater conditions. If you’re traveling internationally, border crossings at El Paso–Ciudad Juárez and Laredo–Nuevo Laredo put you right on the river corridor. Now, here’s a sobering fact: conservation groups report that drought has cut the river’s average annual flow to about 800,000 acre-feet as of 2026. That’s less than half of what it was in the 1950s, according to the U.S. Geological Survey.