1. The terrain is full of mountains.
For some strange reason, people rarely associate Mexico with mountains. But note all the ranges: The Western Sierra Madre–essentially the considered the Rockies from the US and Canada–extends over 1,250 km from Sonora to Nayarit. Paralleling that is the eastern Sierra Madre range which spans 1,300 km from Texas to Oaxaca. The Southern Sierra Madre reaches from Jalisco to the Isthmus of Tehuantepec in Oaxaca. Finally, the jagged sierras of Chiapas and Baja California rise up through those states as well.