The Ksi Sii Aks (; formerly gazetted as the Tseax River ) is a tributary of the
Nass River
The Nass River is a river in northern British Columbia, Canada. It flows from the Coast Mountains southwest to Nass Bay, a sidewater of Portland Inlet, which connects to the North Pacific Ocean via the Dixon Entrance. Nass Bay joins Portland I ...
in northwestern
British Columbia
British Columbia is the westernmost Provinces and territories of Canada, province of Canada. Situated in the Pacific Northwest between the Pacific Ocean and the Rocky Mountains, the province has a diverse geography, with rugged landscapes that ...
, Canada.
It is most notable as the namesake of
Tseax Cone
Tseax Cone ( ) is a small volcano in the Nass Ranges of the Hazelton Mountains in northwestern British Columbia, Canada. It has an elevation of and lies within an east–west valley through which a tributary of the Tseax River flows. The ...
, a
volcano
A volcano is commonly defined as a vent or fissure in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface.
On Earth, volcanoes are most oft ...
within its basin that was responsible for an eruption in the 17th century that killed 2,000 Nisgaʼa people. Prior to the eruption, the
Nisgaʼa name for this river was .
[ Buried by the eruption, it eventually resurfaced. The Nisgaʼa recognized it as the same stream but renamed it Ksi Sii Aks: means "new body of water".][ Lower ]Vetter Creek
Vetter Creek is a tributary of the Nass River in the northern part of the province of British Columbia, Canada.
From its source at Xhlawit (formerly "Vetter Mountain"), Vetter Creek flows generally east and north for roughly
Length measured usi ...
, just west of Ksi Sii Aks, was also buried by lava from Tseax Cone. Both flow through Nisga'a Memorial Lava Bed Provincial Park
Nisga'a Memorial Lava Bed Provincial Park (Nisga'a: ) is a provincial park in the Crater Creek, Tseax River and Nass River valleys of northwestern British Columbia, Canada, about 80 kilometres north of Terrace, and near the Nisga'a Villages of ...
as they near their confluences with the Nass River.
As prescribed by terms of the Nisgaʼa Treaty, the Tseax River was officially renamed the Ksi Sii Aks on 11 May 2000.[Length measured using Google Maps path tool, BCGNIS coordinates, topographic maps, an]
TopoQuest
From its source near Sand Lake the river flows through Sand Lake, Gainor Lake, and Lava Lake. It collects many tributary streams, the largest of which are Poupard Creek, May Creek, Alder Creek, Crater Creek, Auk Creek, and Gitzyon Creek.
See also
*List of rivers of British Columbia
The following is a partial list of rivers of British Columbia, organized by drainage basin, watershed. Some large creeks are included either because of size or historical importance
(See Alphabetical List of British Columbia rivers ). Also includ ...
References
Nass Country
Rivers of British Columbia
Cassiar Land District
Nisga'a
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