mountain range
US /ˈmaʊn.tɪn ˌreɪndʒ/
UK /ˈmaʊn.tɪn ˌreɪndʒ/

1.
a line of mountains connected by high ground
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The Himalayas are the world's highest mountain range.
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We plan to hike through a beautiful mountain range next summer.
a line of mountains connected by high ground