Mountain Range
noun
A mountain vein is a vein that extends across the land, and is covered in mountains. This refers to a mountain range.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
ヒマラヤ山脈は多種多様な自然に恵まれています。
The Himalayan Mountain range is rich with a wide variety of nature.