The GILA River is a major tributary of the Colorado River located in New Mexico and Arizona. It is approximately 649 miles long and is the sixth longest river in the United States. The Mora River is a tributary of the Pecos River located in New Mexico. It is approximately 95 miles long and is a popular destination for fishing, camping, and other recreational activities. Both the GILA and Mora Rivers are part of the larger River of New Mexico.