Rios is a common Spanish word for rivers, and Mexico is home to many of them. The Rio Grande, or Rio Bravo, is the longest river in Mexico, stretching from the United States border to the Gulf of Mexico. Other major rivers in Mexico include the Grijalva, Usumacinta, Papaloapan, and Balsas. These rivers are important sources of water for the country, providing irrigation for agriculture and hydroelectric power.