A Range … like the Alps Mountain Range
A group of mountains is commonly referred to as a range or a mountain range.
cordillera
A group of mountains is commonly referred to as a range or a mountain range.
massif.add possibly a seamount chain, but these are usually quite extended.
That would be the Himalayan chain of mountains.
A group of many mountains is called a mountain range or a mountain chain.
You may be thinking of the Trans-Antarctic mountains.
A string of mountains is called a mountain chain.
Many things are similar to a group of mountains, such as a group of hills, a volcanic chain of islands, or a wrinkle in a door mat that doesn't lay flat.
Appalachian Mountains (oldest in US)
The collective nouns are:a range of mountainsa chain of mountains.
Mid-Atlantic chain