The Sumallo River is located in southern

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

, in the

Cascade Mountains The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as the North Cascades, ...

to the east of

Hope Hope is an optimistic state of mind that is based on an expectation of positive outcomes with respect to events and circumstances in one's life or the world at large. As a verb, its definitions include: "expect with confidence" and "to cherish ...

. It begins on the east slopes of

Mount Payne Mount Payne is a mountain summit located in the Canadian Cascades of southwestern British Columbia, Canada. It is situated southeast of Hope, northeast of Chilliwack Lake, and west of Silvertip Mountain, which is its nearest higher peak. Foll ...

, south of the village of Sunshine Valley. It flows north until it reaches Sunshine Valley where it turns southeast and proceeds into

Manning Park E.C. Manning Provincial Park is a provincial park in British Columbia, Canada. It is usually referred to as Manning Park, although that nomenclature is also used to refer to the resort and Gibson Pass Ski Area, ski area at the park's core. The pa ...

. It continues southeast within the park, running alongside

Highway 3 The following highways are numbered 3, H-3, PRI-3, AH3, E03 and R3. For roads numbered A3, see A3 roads. For roads numbered M3, see M3. For roads numbered N3, see N3. For roads numbered 3A, see 3A. International * Asian Highway 3 * Europ ...

before eventually meeting the

Skagit River The Skagit River ( ) is a river in southwestern British Columbia in Canada and northwestern Washington in the United States, approximately 150 mi (240 km) long. The river and its tributaries drain an area of 1.7 million acres (690,000 ...

at the northern boundary of Skagit Valley Provincial Park, to the northeast of Marmot Mountain. The name comes from the word ''Semall-á-ow'' given to Alexander Caulfield Anderson by his

Nlaka'pamux The Nlaka'pamux or Nlakapamuk ( ; ), also previously known as the ''Thompson'', ''Thompson River Salish'', ''Thompson Salish'', ''Thompson River Indians'' or ''Thompson River people'', and historically as the ''Klackarpun'', ''Haukamaugh'', ''Kni ...

guide on an 1846 journey through 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 C ...

. This word is not from the

Halkomelem 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 ...

language from local Sto:lo people, so it may be a Nlaka'pamuctsin (Thompson) word. Ethnographic Overview of Stó:lo People and the Traditional Use of the Hudson's Bay Company Brigade Trail Area
Brian Thom (Written while working at Stó:lo Nation, Chilliwack, BC) Prepared for: Chilliwack Forest District, Ministry of Forests For Contract No. 12015-20/CS96DCK-002. August 1995

References

Rivers of British Columbia Canadian Cascades {{BritishColumbia-river-stub