Sumas Mountain, also referred to as Canadian Sumas to distinguish it from an identically-named mountain just to the south in

U.S. state In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its sover ...

Washington Washington commonly refers to: * Washington (state), United States * Washington, D.C., the capital of the United States ** A metonym for the federal government of the United States ** Washington metropolitan area, the metropolitan area centered o ...

across the

border Borders are usually defined as geographical boundaries, imposed either by features such as oceans and terrain, or by political entities such as governments, sovereign states, federated states, and other subnational entities. Political borders c ...

, is a mountain in eastern

Fraser Lowland The Fraser Lowland is a landform and physiographic region in the Pacific Northwest of North America, shared between the Canadian province of British Columbia and the U.S. state of Washington. The region includes much of the Lower Mainland region ...

, in the

Lower Mainland The Lower Mainland is a geographic and cultural region of the mainland coast of British Columbia that generally comprises the regional districts of Metro Vancouver and Fraser Valley. Home to approximately 3.05million people as of the 2021 Canadia ...

region of 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 North ...

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, ...

. It sits on the south bank of the

Fraser River The Fraser River is the longest river within British Columbia, Canada, rising at Fraser Pass near Blackrock Mountain in the Rocky Mountains and flowing for , into the Strait of Georgia just south of the City of Vancouver. The river's annual d ...

, west of the smaller

Chilliwack Mountain Chilliwack Mountain is a small mountain rising from the floodplain of the Fraser River in the city of Chilliwack, British Columbia, Canada Canada is a country in North America. Its ten provinces and three territories extend from the A ...

across the

Vedder River Vedder is a Dutch and Low German surname. ''Vedder'', related to Dutch ('father'), meant 'uncle' (father's or mother's brother) in Middle Dutch and Eastern dialects of Dutch. Notable people with the surname include: * Adam Swart Vedder (1834–190 ...

mouth In animal anatomy, the mouth, also known as the oral cavity, or in Latin cavum oris, is the opening through which many animals take in food and issue vocal sounds. It is also the cavity lying at the upper end of the alimentary canal, bounded on ...

, and serves as a geographic

landmark A landmark is a recognizable natural or artificial feature used for navigation, a feature that stands out from its near environment and is often visible from long distances. In modern use, the term can also be applied to smaller structures or f ...

dividing the

Fraser Valley The Fraser Valley is a geographical region in southwestern British Columbia, Canada and northwestern Washington State. It starts just west of Hope in a narrow valley encompassing the Fraser River and ends at the Pacific Ocean stretching from the ...

into "Upper" and "Lower" sections. The mountain is separated from the

Vedder Mountain The Vedder Mountain is a branch of the Cascade Range in the Pacific Northwest, located at the southeastern edge of the Fraser Lowland in British Columbia, Canada, between the village of Yarrow and the village of Cultus Lake, extending from the Vedd ...

and the

North Cascades The North Cascades are a section of the Cascade Range of western North America. They span the border between the Canadian province of British Columbia and the U.S. state of Washington and are officially named in the U.S. and Canada as the Cascad ...

by the drained

Sumas Lake Sumas () is a city in Whatcom County, Washington, United States. It had a population of 1,307 as of the 2010 census. Sumas is located adjacent to the Canada–U.S. border and borders the city of Abbotsford, British Columbia. The Sumas-Huntingd ...

, now a

flatland ''Flatland: A Romance of Many Dimensions'' is a satirical novella by the English schoolmaster Edwin Abbott Abbott, first published in 1884 by Seeley & Co. of London. Written pseudonymously by "A Square", the book used the fictional two-dime ...

called

Sumas Prairie Sumas Prairie is a landform in British Columbia, Canada and the State of Washington, United States. Part of the Fraser Lowland, it was created by the draining of Sumas Lake early in the 20th Century, and extends from the Vedder Canal southwestwar ...

that is part of the greater floodplain of the Fraser River basin, south of which is a same-named sister mountain ( American Sumas) in

Washington state Washington (), officially the State of Washington, is a state in the Pacific Northwest region of the Western United States. Named for George Washington—the first U.S. president—the state was formed from the western part of the Washington ...

Whatcom County Whatcom County is a county located in the northwestern corner of the U.S. state of Washington, bordered by the Canadian Lower Mainland (the Metro Vancouver and Fraser Valley Regional Districts of British Columbia) to the north, Okanogan ...

. West of the mountain is

Matsqui Prairie Matsqui is a former district municipality in British Columbia, Canada. It was incorporated in 1892 and merged with the district municipality of Abbotsford in 1995 to create the new City of Abbotsford. Matsqui used to be the western part of what is ...

, another floodplain, and north of the Fraser, which lies along the mountain's north flank, are similar floodplains -

Nicomen Island Nicomen Island is an island in the Fraser Valley region of southwestern British Columbia. Nicomen Mountain in the Douglas Ranges lies to the north across Nicomen Slough. Chilliwack Mountain lies to the south across the Fraser River. Adjacent to th ...

and

Hatzic Prairie Hatzic is a historic community in the Central Fraser Valley region of the Lower Mainland of British Columbia, Canada, located on the east side of the District of Mission and including areas beyond the municipal boundary to the east and northea ...

. The urban area of Abbotsford is located to the mountain's west, and it is home to a number of Abbotsford's suburban areas, notably

Clayburn Clayburn is British Columbia’s first company town. It is situated at the foot of Sumas Mountain within the boundaries of the City of Abbotsford. Today the village and the brick plant site are classified as the municipally designated Clayburn Vil ...

. In its central portion is the historic community of Straiton, officially named in 1904 for Thomas Bell Straiton who founded a homestead on Sumas Mountain in 1893 and also a store and post office. Its higher eastern reaches tower over Greendale, a community within the City of Chilliwack and is mostly wilderness; the mountain's summit,

Sumas Peak Sumas Mountain, also referred to as Canadian Sumas to distinguish it from an identically-named mountain just to the south in U.S. state of Washington across the border, is a mountain in eastern Fraser Lowland, in the Lower Mainland region of ...

, is located in this area, along with

Chadsey Lake Chadsey Lake, also known as Lost Lake, is located on Sumas Mountain near Abbotsford, British Columbia. Name Chadsey Creek flows into the lake and was named in 1939, after pioneer William Harvey Chadsey, son of William Chadsey and Mary Jane Town ...

. Sumas Mountain Provincial Park is located in the higher, northern reaches of the mountain. Historic industry on the mountain includes livestock and crop farming, logging, and mining, notably brick-clay, which gave rise to the mining community of Clayburn. Farming, gravel mining, and logging continue on the mountain to the present day. Located on the mountain's north foot, adjacent to the Fraser, is a Canadian Forces base naval station. On its south side is the reserve of the Sumas First Nation. The mountain protects McDonald Park, a

dark-sky preserve A dark-sky preserve (DSP) is an area, usually surrounding a park or observatory, that restricts artificial light pollution. The purpose of the dark-sky movement is generally to promote astronomy. However, astronomy is certainly not the only obje ...

, from the

light pollution Light pollution is the presence of unwanted, inappropriate, or excessive use of artificial Visible spectrum, lighting. In a descriptive sense, the term ''light pollution'' refers to the effects of any poorly implemented lighting, during the day ...

caused by the nearby cities of Abbotsford,

Chilliwack Chilliwack ( )( hur, Ts'elxwéyeqw) is a city in the province of British Columbia, Canada. Chilliwack is surrounded by mountains and home to recreational areas such as Cultus Lake and Chilliwack Lake Provincial Parks. There are numerous outdoor ...

, and

Mission Mission (from Latin ''missio'' "the act of sending out") may refer to: Organised activities Religion *Christian mission, an organized effort to spread Christianity *Mission (LDS Church), an administrative area of The Church of Jesus Christ of ...

Name

"Sumas" is a

Halqemeylem Halkomelem (; in the Upriver dialect, in the Island dialect, and in the Downriver dialect) is a language of various First Nations peoples of the British Columbia Coast. It is spoken in what is now British Columbia, ranging from southeastern ...

word meaning "a big level opening", referring to the Sumas Prairie area south of the mountain, formerly

. A common 19th Century spelling of Sumas was "Smess"; Simon Fraser's journal recorded the name as "shemotch". FraserRiverPanorama

References

Mountains of the Lower Mainland Abbotsford, British Columbia {{BritishColumbia-geo-stub