Canmore
The Dublin Mountains, which are just the northern fringe of the Wicklow Mountains.
That would be the Himalayan chain of mountains.
You may be thinking of the Trans-Antarctic mountains.
Appalachian Mountains (oldest in US)
Mid-Atlantic chain
a mountain range
the hee hee
The collective nouns for mountains are a chain of mountains or a range of mountains.
The chain of mountains in the northeast of Spain are the Pyrenees.
The Rocky mountains.
The Himalaya Mountains :D
Himalaya Mountain