Ciudad Juárez is the largest city in the Mexican state of Chihuahua. Commonly referred to by locals as simply Juárez, and known as Paso del Norte (Pass of the North) until 1888, Juárez is the seat of the municipality of Juárez with an estimated population of 1.5 million people. The city lies on the Rio Grande (Río Bravo del Norte) 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 (after San Diego–Tijuana), with a combined population of over 2.7 million people.