The Andes - over 4,000 miles! There are longer ones if you include mountain ranges under water...
The mountain with the longest range, is the rocky mountains.
Appalachian
Applalachain Mountain Range
Appalachians.
The longest mountain range in the United States is the Rocky Mountains. Not only is this mountain range the longest in the United States, but at over 3,000 miles in length it's the longest mountain range in the world.
it goes to Canada to Alabama.
the rocky mountains
Appalachians range
It would have to be the Rockies.
a mountain rage is a chain of mountains clashed together by earth quakes
The Rocky Mountains