A mountain range or mountain belt: a chain of mountains arranged in a line or band. Example: the Alps mountain range.
日本には多くの山脈があり、地形が険しい地域もある。
Japan has many mountain ranges, and some regions have rugged terrain.
ヒマラヤ山脈は世界でも最も高い山脈の一つだ。
The Himalaya mountain range is one of the highest in the world.
山脈の間に深い谷ができている。
Deep valleys have formed between the mountain ranges.