Tlaltenango de Sánchez Román is a municipality located in the southwestern portion of the Mexican state of Zacatecas. The average elevation of the municipality is 1,723 meters (5,653 ft) above sea level and the municipality covers an area of 808.082 square kilometres (312.002 sq mi). The municipality lies in a valley bordered by the Sierra de Morones and lies on the banks of the Tlaltenango River, which runs north and is a tributary of the Bolaños River.

The municipality of Colotlán is in the northern extremity of the Mexican state of Jalisco. The municipality covers an area of approximately 648 square kilometers. Colotlán is located at 22°12′N 103°18′W. It stands at 1,550 metres (5,090 ft) above sea level.