The Cassiar Mountains (French: Chaîne des Cassiars) are the most northerly group of the Northern Interior Mountains in the Canadian province of British Columbia and also extend slightly into the southernmost Yukon Territory.

They form a section of the Continental Divide, that, in this region, separates water drainage between the Arctic and Pacific Oceans.

In the western Cassiar Mountains lie the remnants of a prehistoric shield volcano called the Maitland Volcano which formed between 5 and 4 million years ago during the Pliocene period.

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