The largest river in Texas is what?

• A. Rio Grande River
• B. Red River
• C. Brazos River
• D. Colorado River

Answer: (A)

Think about which river covers the most distance in Texas. The Rio Grande is the longest river that flows through the state, running from the western mountains down to the Gulf of Mexico and forming a large part of the Texas–Mexico border. That long path makes it longer than the other rivers listed, which are shorter within Texas. So the largest river in Texas is the Rio Grande.