The terrain was mountainous.
it is mountains
Mountainous is an adjective.
Iceland is mountainous.
Yes, South Korea is mountainous.
Yes! Most of all Kosovo is mountainous !
Switzerland is noted for its mountainous terrain.
The root word of mountainous is "mountain."
Mountainous Croatia's population is 90,643.
35% of Africa is mountainous.
Zurich, Gstaad and Berne are all mountainous.
a small mountainous country in Europe