As such, the majority of the Mexican central and northern territories are located at high altitudes, and the highest elevations are found at the Trans-Mexican Volcanic Belt: Pico de Orizaba (), Popocatépetl () and Iztaccihuatl () and the Nevado de Toluca (). Three major urban agglomerations are located in the valleys between these four elevations: Toluca, Greater Mexico City and Puebla.