, photo = Cassiar Highway.jpg , photo_size = 280px , photo_caption = Cassiar Mountains along Stewart-Cassiar Highway near Good Hope Lake , country =

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by to ...

, subdivision1_type = Provinces , subdivision1 = , parent =

Interior Mountains The Interior Mountains or Northern Interior Mountains are the semi-official names for an expansive collection of mountain ranges that comprises much of the northern half of the Canadian province of British Columbia and a large area of southern Y ...

, geology = , orogeny = , highest =

Thudaka Peak Thudaka Peak is the highest mountain of the Thudaka Range of the Cassiar Mountains in the Northern Interior of British Columbia, Canada, located between the heads of Obo River and Frog River. Glaciers exist on Thudaka's northern flanks, but the ...

, highest_location = British Columbia , elevation_m = 2748 , range_coordinates = , coordinates = , map_image = Alaska Panhandle-relief Cassiar Mountains.png , map_size = 280px The Cassiar Mountains (french: Chaîne des Cassiars) are the most northerly group of the Northern Interior Mountains in the

Canadian province Within the geographical areas of Canada, the ten provinces and three territories are sub-national administrative divisions under the jurisdiction of the Canadian Constitution. In the 1867 Canadian Confederation, three provinces of British Nor ...

British Columbia British Columbia (commonly abbreviated as BC) is the westernmost province of Canada, situated between the Pacific Ocean and the Rocky Mountains. It has a diverse geography, with rugged landscapes that include rocky coastlines, sandy beaches, for ...

and also extend slightly into the southernmost

Yukon Territory Yukon (; ; formerly called Yukon Territory and also referred to as the Yukon) is the smallest and westernmost of Canada's three territories. It also is the second-least populated province or territory in Canada, with a population of 43,964 as ...

. They lie north and west of the Omineca Mountains, west of the northernmost Rockies and the

Rocky Mountain Trench The Rocky Mountain Trench, also known as the Valley of a Thousand Peaks or simply the Trench, is a large valley on the western side of the northern part of North America's Rocky Mountains. The Trench is both visually and cartographically a ...

, north of the

Hazelton Mountains The Hazelton Mountains are a grouping of mountain ranges on the inland lee of the Kitimat Ranges of the Coast Mountains in northwestern British Columbia, Canada, spanning the area of Hazelton south to the Nechako Reservoir. Defined by the Britis ...

and east of the

Boundary Ranges The Boundary Ranges, also known in the singular and as the Alaska Boundary Range, are the largest and most northerly subrange of the Coast Mountains. They begin at the Nass River, near the southern end of the Alaska Panhandle in the Canadian pr ...

. They form a section of the

Continental Divide A continental divide is a drainage divide on a continent such that the drainage basin on one side of the divide feeds into one ocean or sea, and the basin on the other side either feeds into a different ocean or sea, or else is endorheic, not c ...

, that, in this region, separates water drainage between the Arctic and Pacific Oceans. Physiographically, they are a section of the larger Yukon-Tanana Uplands province, which in turn are part of the larger

Intermontane Plateaus In the context of physical geography, the Intermontane Plateaus is one of eight physiographic regions of the contiguous United States. The region consists mostly of plateaus and mountain ranges lying between the Rocky Mountains on the east and t ...

physiographic division. In the western Cassiar Mountains lie the remnants of a prehistoric

shield volcano A shield volcano is a type of volcano named for its low profile, resembling a warrior's shield lying on the ground. It is formed by the eruption of highly fluid (low viscosity) lava, which travels farther and forms thinner flows than the more vi ...

called the Maitland Volcano which formed between 5 and 4 million years ago during the

Pliocene The Pliocene ( ; also Pleiocene) is the epoch in the geologic time scale that extends from 5.333 million to 2.58Thudaka Peak Thudaka Peak is the highest mountain of the Thudaka Range of the Cassiar Mountains in the Northern Interior of British Columbia, Canada, located between the heads of Obo River and Frog River. Glaciers exist on Thudaka's northern flanks, but the ...

, at .

Sub-ranges and major summits

Dease Plateau The Dease Plateau is a sub-plateau of the larger Yukon Plateau, and is located in far northern British Columbia, Canada, northwest from the Deadwood River to and beyond the Yukon-British Columbia boundary. The plateau is named in association w ...

** Horseranch Range * Kechika Ranges **

Mount Skook Davidson Mount Skook Davidson, , is a mountain in the Kechika Ranges of the Cassiar Mountains in far northern British Columbia, Canada. It overlooks the "Diamond J Ranch", which was founded by John Ogilvie Davidson also known as "Skook" Davidson or "Sk ...

Sifton Ranges The Sifton Ranges are a mountain range along the west side of the Rocky Mountain Trench in northern British Columbia, Canada. It has an area of 1823 km2 and is a subrange of the Cassiar Mountains which in turn form part of the Interior Mo ...

Cormier Range The Cormier Range is a subrange of the Sifton Ranges, located between the Finlay River The Finlay River is a 402 km long river in north-central British Columbia flowing north and thence south from Thutade Lake in the Omineca Mountains to W ...

** Ruby Range *

Stikine Ranges The Stikine Ranges are a group of mountain ranges and mountainous plateaus in northwestern British Columbia, Canada. They are the northernmost subdivision of the Cassiar Mountains and among the least explored and most undeveloped parts of the pr ...

Beady Range The Beady Range is a subrange of the Stikine Ranges of mountains, located northeast of northern Dease Lake Dease Lake is a small community located in the Cassiar Country of the Northern Interior of British Columbia, Canada. It is located a ...

Nisutlin Plateau The Nisutlin Plateau is a sub-plateau, of the Yukon Plateau physiographic section, in northern British Columbia, Canada, extending east from Teslin Lake to the Cassiar Mountains The Cassiar Mountains (french: Chaîne des Cassiars) are the most ...

Skree Range The Skree Range is a subrange of the Stikine Ranges, located between the Dease River The Dease River flows through northwestern British Columbia, Canada and is a tributary of the Liard River. The river descends from Dease Lake, though its ul ...

Three Sisters Range The Three Sisters Range is a subrange of the Stikine Ranges, located northwest of junction of the Stikine and McBride Rivers in northern British Columbia, Canada and to the southeast of the community of Dease Lake Dease Lake is a small ...

Thudaka Range The Thudaka Range is a mountain range located east of the Rocky Mountain Trench in British Columbia, Canada bounded by the Obo River on the east, the Frog River on the west, and on the south by the pass between Geese and Thudaka Creeks. The hi ...

***

Tuya Range The Tuya Range is a mountain range in the Stikine Ranges of the Cassiar Mountains in the far north of the Canadian province of British Columbia, near its border with the Yukon Territory and to the southwest of Watson Lake, Yukon, which is the ne ...

*** Ash Mountain

References

* * Physiographic sections Northern Interior of British Columbia Mountain ranges of British Columbia Mountain ranges of Yukon {{Yukon-geo-stub