Ciudad Juárez, commonly referred to as just Juárez, is the most populous city in the Mexican state of Chihuahua. It was known until 1888 as El Paso del Norte. It is the seat of the Juárez Municipality with an estimated population of 2.5 million people. Juárez lies on the Rio Grande river, south of El Paso, Texas, United States. Together with the surrounding areas, the cities form El Paso–Juárez, the second largest binational metropolitan area on the Mexico–U.S. border, with a combined population of over 3.4 million people.

Chihuahua, officially the Estado Libre y Soberano de Chihuahua, is one of the 31 states which, along with Mexico City, comprise the 32 federal entities of Mexico. It is located in the northwestern part of Mexico and is bordered by the states of Sonora to the west, Sinaloa to the southwest, Durango to the south, and Coahuila to the east. To the north and northeast, it shares an extensive border with the U.S. adjacent to the U.S. states of New Mexico and Texas. The state was named after its capital city, Chihuahua City; the largest city is Ciudad Juárez.