The Sumallo River is located in southern

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, ...

, 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, a ...

to the east of Hope. It begins on the east slopes of Mount Payne, south of the village of

Sunshine Valley Sunshine Valley is an unincorporated community consisting of cabins, tiny homes, and RV parks on the Crowsnest Highway between the town of Hope (NW) and the entrance to Manning Park in the Cascade Mountains of British Columbia. The community has ...

. 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 ski area at the park's core. The park covers 83,671 hecta ...

. 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 * Europea ...

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 Skagit Valley Provincial Park is a provincial park in British Columbia, Canada, centred on the Skagit River and its tributaries. The park is 27,964 Hectares. The park borders E. C. Manning Provincial Park in Canada and Ross Lake National Recreati ...

, to the northeast of Marmot Mountain. The name comes from the word ''Semall-á-ow'' given to

Alexander Caulfield Anderson Alexander Caulfield Anderson (10 March 1814 – 8 May 1884) was a British Hudson's Bay Company (HBC) fur-trader, explorer of British Columbia and civil servant. Anderson joined HBC in 1831 and emigrated to Canada from Europe. He was placed ...

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 Casca ...

. 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 The Thompson language, properly known as Nlaka'pamuctsin, also known as the Nlaka'pamux ('Nthlakampx') language, is an Interior Salishan language spoken in the Fraser Canyon, Thompson Canyon, Nicola Country of the Canadian province of British C ...

(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