Greenland
It is the southern border for Texas; conversely, it is the northern border for Mexico.
Northern Mexico has a lot more mountains and southern Mexico has a lot more rivers.
Northern Mexico has a lot more mountains and southern Mexico has a lot more rivers.
The Tropic of Cancer (23° 26' 22'' N) effectively divides the country into northern temperate and southern subtropical zones. However, northern Mexico is dominated by the Sonoran and Chihuahuan deserts, while southern Mexico is dotted with tropical rainforests.
Central America.
It is on southern New Mexico (the US state), but it is located on northern Mexico (the country).
Actually, Mexico is divided on northern and southern halves by the Tropic of Cancer.
Southern
Border? It is on the southern US border.
It's actually in Arizona, but partially in Northern Mexico.
valley of mexico
Harder, not so much, respectively.