Cerro El Potosí is the highest mountain in the Sierra Madre Oriental mountain range of northeast Mexico.
It is located in the state of Nuevo León, about 80 km (50 mi) south of Monterrey.

It is composed of limestone, and is noted for its very diverse flora including several endemic or near-endemic species, such as the Potosi Pinyon.
At the foot of the mountain, a series of springs and endorheic basins were the only site in which the pupfish Cyprinodon alvarezi and Megupsilon aporus, and the dwarf crayfish Cambarellus alvarezi lived.
The last two are entirely extinct, while Cyprinodon alvarezi is extinct in the wild (only survives in captivity).

Access was very difficult in the past, but in the 1960s a microwave relay station was built on the summit, with the road built for this providing easy access from the east.
Cerro El Potosí is the highest mountain in the Sierra Madre Oriental mountain range of northeast Mexico. It is located in the state of Nuevo León, about 80 km (50 mi) south of Monterrey.
It is composed of limestone, and is noted for its very diverse flora including several endemic or near-endemic species, such as the Potosi Pinyon. At the foot of the mountain, a series of springs and endorheic basins were the only site in which the pupfish Cyprinodon alvarezi and Megupsilon aporus, and the dwarf crayfish Cambarellus alvarezi lived. The last two are entirely extinct, while Cyprinodon alvarezi is extinct in the wild (only survives in captivity). 
Access was very difficult in the past, but in the 1960s a microwave relay station was built on the summit, with the road built for this providing easy access from the east.
Cerro Potosí