Das Gebirge

Wir fahren ins Gebirge.
(I've found it in the Internet, but why is it "INS" here? Isn't it "Gebirge" plural form? Do we say as in english "we go to the mountains" (plural)?

Wir wohnen im Gebirge. (We live in the mountains).

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The mountain in German is called "der Berg" and its plural, the mountains "die Berge"

A collection of mountains or "the mountain range" is called "das Gebirge" (singular). For example "Himalaya ist ein Gebirge".

The prepositon "in" can take accusative or dative depending upon whether movement or location is mentioned.

Fahren in + akkusative (because of direction of motion from A to B): Wir fahren in das (ins) Gebirge

Wohnen in  + dative (location B):  Wir wohnen im Gebirge. 

das Gebirge

Wir fahren ins Gebirge.
(I've found it in the Internet, but why is it "INS" here? Isn't it "Gebirge" plural form? Do we say  in english "we go to the mountain" (plural)?

Wir wohnen im Gebirge. (We live in the mountain).

ins=in das

it's not in plural form

im = in dem

why?because "fahren" is a verb with movement and direction,but "wohnen" is not.