The Great Himalaya Range forms the northern border of Southern Asia. These mountains average over 20,000 feet and stretch for 1400 miles.
Most of the northern boundary is formed by the Alps. However, on the Iberian Peninsula, the Pyrenees form another northern border of Southern Europe.
ALBORZ
Himalayas
Elburz Mountains
The 49th Parallel.
The Carpathian Mountains.
the himalaya's,hindu kush and the caracum
West Virginia, Ohio, Illinois, and Indiana form the northern border of Kentucky, along the Ohio River.
Rio Grande forms the Southern border of the United states.
Rio Grande forms the Southern border of the United states.
Rio Grande makes up most of the southern border of the United States, it also makes up most of the northern border of Mexico
The Mississippi river forms the western border of the southern colonies.