Where does the rio grande river start?

According to the International Boundary and Water Commission, the Rio Grande River starts in the San Juan Mountains in Colorado and continues 1,901 miles to the Gulf of Mexico. It is among the 20 longest rivers in the world and is the fifth-longest in the United States. read more

The Rio Grande (/ ˈ r iː oʊ ˈ ɡ r æ n d / or / ˈ r iː oʊ ˈ ɡ r ɑː n d eɪ /; Spanish: Río Bravo del Norte, pronounced [ˈri.o ˈβɾaβo ðel ˈnorte] or simply Río Bravo) is one of the principal rivers in the southwest United States and northern Mexico (the other being the Colorado River). read more

This is not true. The Rio Grande river is also the border between Texas and Mexico. It ends at the Gulf of Mexico at the Texas Mexico border. read more