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the ural mountain
Mount Everest, which is found in the Himalayas mountain range
the Himalayan mountain and the karakoram mountain
Most of the northern boundary is formed by the Alps. However, on the Iberian Peninsula, the Pyrenees form another northern border of Southern Europe.
Appalachian Mountain range
The border between France and Spain is formed by the Pyrenees ("Pyrénées" in French)
Rocky Mountains
Karakoram and Himalaya mountain ranges.
The Missouri River forms the border between Iowa and Nebraska.
The Ural mountains formed as a result of the collision of Europe with Asia and are folded mountains. Fold mountains are mountain ranges that are formed when two of the tectonic plates that make up the Earth's crust push together at their border. The extreme pressure forces the edges of the plates upwards into a series of folds.
No.
The Rio Grande (Rio Bravo, as known in Mexico) qualifies as the current natural border between the U.S. and Mexico.