The Nass Ranges are a mountain range

Mountain range

A mountain range is a single, large mass consisting of a succession of mountains or narrowly spaced mountain ridges, with or without peaks, closely related in position, direction, formation, and age; a component part of a mountain system or of a mountain chain...

 north of the Skeena River

Skeena River

The Skeena River is the second longest river entirely within British Columbia, Canada . The Skeena is an important transportation artery, particularly for the Tsimshian and the Gitxsan - whose names mean "inside the Skeena River" and "people of the Skeena River" respectively, and also during the...

, west of Hazelton

Hazelton, British Columbia

Hazelton is a small town located at the junction of the Bulkley and Skeena Rivers in northern British Columbia, Canada. It was founded in 1866 and has a population of 293...

, and northeast of Terrace, British Columbia

Terrace, British Columbia

Terrace is a city on the Skeena River in British Columbia, Canada. The Kitselas people, a tribe of the Tsimshian Nation, have lived in the Terrace area for thousands of years. The community population fell between 2001 and 2006 from 12,109 with a regional population of 19,980 to 11,320 and...

, Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

. It is associated with the Hazelton Mountains

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, British Columbia south to the Nechako Reservoir...

, which in turn form part of the Interior Mountains

Interior Mountains

The Interior Mountains, also called the Northern Interior Mountains and Interior Ranges, are the semi-official names for a huge area that comprises much of the northern two thirds of the Canadian province of British Columbia and a large area of southern Yukon...

.

Volcanic eruption

The Nass Ranges contain an active volcano called Tseax Cone

Tseax Cone

The Tseax Cone , also called the Tseax River Cone or alternately the Aiyansh Volcano, is a young cinder cone and adjacent lava flows associated with the Nass Ranges and the Northern Cordilleran Volcanic Province...

; its volcanic gas

Volcanic gas

|250px|thumb|right|Image of the [[rhyolitic]] [[lava dome]] of [[Chaitén Volcano]] during its 2008-2010 eruption.Volcanic gases include a variety of substances given off by active volcanoes...

es caused the death of approximately 2,000 Nisga'a

Nisga'a

The Nisga’a , often formerly spelled Nishga and spelled in the Nisga’a language as Nisga’a, are an Indigenous nation or First Nation in Canada. They live in the Nass River valley of northwestern British Columbia. Their name comes from a combination of two Nisga’a words: Nisk’-"top lip" and...

 people during the 18th century.

Mountains

Mountains within the Nass Ranges include:

• Kiteen Ridge
• Maroon Mountain
• Mount Garland
• Tseax Cone
  Tseax Cone
  The Tseax Cone , also called the Tseax River Cone or alternately the Aiyansh Volcano, is a young cinder cone and adjacent lava flows associated with the Nass Ranges and the Northern Cordilleran Volcanic Province...