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Discover LudwigThe phrase "are mountains" is correct and usable in written English.
It can be used in contexts where you are describing or identifying mountains, often in a declarative sentence.
Example: "The Himalayas are mountains that stretch across five countries."
Alternatives: "constitute mountains" or "represent mountains".
Dictionary
are mountains
noun
A large mass of earth and rock, rising above the common level of the earth or adjacent land, usually given by geographers as above 1000 feet in height (or 304.8 metres), though such masses may still be described as hills in comparison with larger mountains.
Exact(56)
There are mountains.
There are mountains, coastline, big sky.
There are mountains of knowledge and age.
On that side, there are mountains.
On this side, there are mountains.
Familiar examples are mountains (including volcanic cones), plateaus, and valleys.
Certainly, they are mountains to climb," he added.
THERE are mountains, and then there are the Dolomites.
Crammed into the space are mountains of books, perhaps as many as a hundred thousand.
As far as the eye can see are mountains – and only us.
In mass disasters, there are mountains of data to sift through.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com