The Rio Grande Gorge is a geological feature in northern New Mexico where the watercourse of the Rio Grande follows a tectonic chasm. Beginning near the Colorado border, the approximately 50-mile (80 km) gorge runs from northwest to southwest of Taos, New Mexico, through the basalt flows of the Taos Plateau volcanic field. The gorge depth is 800 feet (240 m) just south of the Rio Grande Gorge Bridge, which spans the gorge 10 miles (16 km) northwest of Taos.

The Rio Grande in the United States or the Río Bravo in Mexico is one of the principal rivers in the southwestern United States and in northern Mexico. The length of the Rio Grande is 1,896 miles (3,051 km), making it the 4th longest river in the United States and in North America by main stem. It originates in south-central Colorado, in the United States, and flows to the Gulf of Mexico. The Rio Grande drainage basin (watershed) has an area of 182,200 square miles (472,000 km2); however, the endorheic basins that are adjacent to and within the greater drainage basin of the Rio Grande increase the total drainage-basin area to 336,000 square miles (870,000 km2).