Montero Cave System

The Montero Cave System is an immense series of caves located beneath the surface of Gao, a human Outer Colony. Located in the Montero region in the Campos Wilderness District, the Montero Cave System was host to the Forerunner Covert Support Base 4276, a support facility for Line Installation 444-447 on the nearby Shaps III in the Shaps system.

List of appearances

 * Halo: Last Light
 * Halo Mythos: A Guide to the Story of Halo