List of longest rivers of Canada

Among the longest rivers of Canada are 47 streams of at least. In the case of some rivers such as the Columbia, the length listed in the table below is solely that of the main stem. In the case of others such as the Mackenzie, it is the combined lengths of the main stem and one or more upstream tributaries, as noted. Excluded from the list are rivers such as the Dauphin, a short connecting link between lakes Manitoba and Winnipeg, with main stems of or less. Also excluded are rivers such as the Mississippi, the main stems of which do not enter Canada even though some of their tributaries do.
Nine rivers in this list cross international boundaries or form them. Four—the Yukon, Columbia, Porcupine, and Kootenay—begin in Canada and flow into the United States. Five—the Milk, Pend d'Oreille, Saint Lawrence, Red, and Saint John—begin in the United States and flow into Canada. Of these, the Milk and the Kootenay cross the international border twice, the Milk leaving and then re-entering the United States, the Kootenay leaving and then re-entering Canada. The drainage basins of these nine rivers extend into both countries; in addition, the drainage basins of six others—the Fraser, Assiniboine, South Saskatchewan, Saskatchewan, Nelson, and Winnipeg—extend into the United States even though their main stems flow entirely within Canada.
Sources report hydrological quantities with varied precision. Biologist and author Ruth Patrick, describing a table of high-discharge rivers, wrote that data on discharge, drainage area, and length varied widely among authors whose works she consulted. "It seems," she said, "that the wisest course is to regard data tables such as the present one as showing the general ranks of rivers, and not to place too much importance on minor differences in figures."

Table

The primary source for data in the table below is The Atlas of Canada; other sources are as noted. Discharge refers to the flow at the mouth except as noted. U.S. states appear in italics. Abbreviations are as follows: "km" for "kilometre", "mi" for "mile", "s" for "second", "m" for "metre", and "ft" for "foot".

#	Name	Mouth	Length	Source	Watershed area	Discharge	Provinces, states	Image
1	Mackenzie River	Beaufort Sea	4241 km 2,635 mi	Thutade Lake	1805200 km² 697,000 mi²	9700 m³/s 340,000 ft³/s	Northwest Territories
2	Yukon River	Bering Sea	3185 km 1,979 mi	Teslin Lake	839200 km² 324,000 mi²	6340 m³/s 224,000 ft³/s	British Columbia, Yukon, Alaska
3	Saint Lawrence River	Gulf of Saint Lawrence	3058 km 1,900 mi	Seven Beaver Lake	1344200 km² 519,000 mi²	9850 m³/s 348,000 ft³/s	Minnesota, Wisconsin, Ontario, Michigan, Ohio, New York, Quebec
4	Nelson River	Hudson Bay	2575 km 1,600 mi	Bow Glacier	892300 km² 344,500 mi²	2370 m³/s 84,000 ft³/s	Manitoba
5	Slave River	Great Slave Lake	2338 km 1,453 mi	Thutade Lake	616400 km² 238,000 mi²	3437 m³/s 121,400 ft³/s	Alberta, Northwest Territories
6	Columbia River	Pacific Ocean	2000 km 1,243 mi	Columbia Lake	671300 km² 259,200 mi²	7730 m³/s 273,000 ft³/s	British Columbia, Washington, Oregon
7	Saskatchewan River	Lake Winnipeg	1939 km 1,205 mi	Bow Glacier	335900 km² 129,700 mi²	700 m³/s 25,000 ft³/s	Alberta, Saskatchewan, Manitoba
8	Peace River	Slave River	1923 km 1,195 mi	Thutade Lake	302500 km² 116,800 mi²	2118 m³/s 74,800 ft³/s	British Columbia, Alberta
9	Churchill River	Hudson Bay	1609 km 1,000 mi	Churchill Lake	281300 km² 108,600 mi²	1200 m³/s 42,000 ft³/s	Alberta, Saskatchewan, Manitoba
10	South Saskatchewan River	Saskatchewan River	1392 km 865 mi	Bow Glacier	146100 km² 56,400 mi²	280 m³/s 9,900 ft³/s	Alberta, Saskatchewan
11	Fraser River	Strait of Georgia	1375 km 854 mi	Fraser Pass	233100 km² 90,000 mi²	3540 m³/s 125,000 ft³/s	British Columbia
12	North Saskatchewan River	Saskatchewan River	1287 km 800 mi	Saskatchewan Glacier	122800 km² 47,400 mi²	245 m³/s 8,700 ft³/s	Alberta, Saskatchewan
13	Ottawa River	Saint Lawrence River	1271 km 790 mi	Laurentian Mountains	146300 km² 56,500 mi²	1950 m³/s 69,000 ft³/s	Quebec, Ontario
14	Athabasca River	Lake Athabasca	1231 km 765 mi	Columbia Icefield	95300 km² 36,800 mi²	783 m³/s 27,700 ft³/s	Alberta
15	Liard River	MacKenzie River	1115 km 693 mi	Saint Cyr Range	277100 km² 107,000 mi²	2446 m³/s 86,400 ft³/s	Yukon, British Columbia, Northwest Territories
16	Assiniboine River	Red River	1070 km 660 mi	near Hazel Dell	182000 km² 70,000 mi²	45 m³/s 1,600 ft³/s	Saskatchewan, Manitoba
17	Milk River	Missouri River	1005 km 625 mi	Blackfeet Indian Reservation	61200 km² 23,600 mi²	m³/s 670 ft³/s	Alberta, Montana
18	Albany River	James Bay	982 km 610 mi	Cat Lake	135200 km² 52,200 mi²	251 m³/s 8,900 ft³/s	Ontario
19	Severn River	Hudson Bay	982 km 610 mi	Deer Lake	102800 km² 39,700 mi²	645 m³/s 22,800 ft³/s	Ontario
20	Back River	Chantrey Inlet	974 km 605 mi	near Aylmer Lake	106500 km² 41,120 mi²	612 m³/s 21,600 ft³/s	Northwest Territories, Nunavut
21	Thelon River	Baker Lake	904 km 562 mi	Lynx Lake	142400 km² 55,000 mi²	840 m³/s 30,000 ft³/s	Northwest Territories, Nunavut
22	La Grande River	James Bay	893 km 555 mi	Lac Nichicun	97600 km² 37,700 mi²	1690 m³/s 60,000 ft³/s	Quebec
23	Red River	Lake Winnipeg	890 km 545 mi	Wahpeton and Breckinridge	287500 km² 111,000 mi²	236 m³/s 8,300 ft³/s	North Dakota, Minnesota, Manitoba
24	Koksoak River	Ungava Bay	874 km 543 mi	Lake Sevestre	133400 km² 51,500 mi²	2800 m³/s 99,000 ft³/s	Quebec
25	Churchill River	Atlantic Ocean	856 km 532 mi	Ashuanipi Lake	79800 km² 30,800 mi²	1580 m³/s 56,000 ft³/s	Labrador
26	Coppermine River	Coronation Gulf	845 km 525 mi	Lac de Gras	50800 km² 19,600 mi²	262 m³/s 9,300 ft³/s	Northwest Territories, Nunavut
27	Dubawnt River	Thelon River	842 km 523 mi	Abitau Lake	57500 km² 22,200 mi²	366 m³/s 12,900 ft³/s	Northwest Territories, Nunavut
28	Winnipeg River	Lake Winnipeg	813 km 505 mi	Trap Lake	135800 km² 52,400 mi²	850 m³/s 30,000 ft³/s	Ontario, Manitoba
29	Kootenay River	Columbia River	780 km 485 mi	Beaverfoot Range	50300 km² 19,400 mi²	850 m³/s 30,000 ft³/s	British Columbia, Montana, Idaho
30	Nottaway River	James Bay	776 km 482 mi	Lake Gilles	65800 km² 25,400 mi²	1190 m³/s 42000 ft³/s	Quebec
31	Rupert River	James Bay	763 km 474 mi	north of Lake Mistassini	43400 km² 16,800 mi²	900 m³/s 32,000 ft³/s	Quebec
32	Eastmain River	James Bay	756 km 470 mi	Lac Bréhat	46400 km² 17,900 mi²	930 m³/s 33,000 ft³/s	Quebec
33	Attawapiskat River	James Bay	748 km 465 mi	Attawapiskat Lake	50500 km² 19,500 mi²	263 m³/s 9,300 ft³/s	Ontario
34	Kazan River	Thelon River	732 km 455 mi	Ennadai Lake	71500 km² 27,600 mi²	540 m³/s 19,000 ft³/s	Nunavut
35	Red Deer River	South Saskatchewan River	724 km 450 mi	Sawback Range	45100 km² 17,400 mi²	70 m³/s 2,500 ft³/s	Alberta
36	Great Whale River	Hudson Bay	724 km 450 mi	Lake Saint-Lusson	42700 km² 16,500 mi²	680 m³/s 24,000 ft³/s	Quebec
37	Porcupine River	Yukon River	721 km 448 mi	Ogilvie Mountains	117900 km² 45,500 mi²	414 m³/s 14,600 ft³/s	Yukon, Alaska
38	Pend d'Oreille River	Columbia River	703 km 437 mi	near Butte	66900 km² 25,800 mi²	820 m³/s 29,000 ft³/s	Idaho, Washington, British Columbia
39	Hay River	Great Slave Lake	702 km 436 mi	near Zama Lake	48200 km² 18,600 mi²	113 m³/s 4,000 ft³/s	Alberta, Northwest Territories
40	Saguenay River	Saint Lawrence River	698 km 434 mi	near Otish Mountains	88000 km² 34,000 mi²	1750 m³/s 62,000 ft³/s	Quebec
41	Anderson River	Beaufort Sea	692 km 430 mi	northwest of Great Bear Lake		142 m³/s 5,000 ft³/s	Northwest Territories
42	Peel River	Mackenzie River	684 km 425 mi	Gill Lake	73600 km² 28,400 mi²	103 m³/s 3,600 ft³/s	Yukon, Northwest Territories
43	Saint John River	Bay of Fundy	673 km 418 mi	Somerset County	55200 km² 21,300 mi²	1130 m³/s 40,000 ft³/s	Maine, New Brunswick
44	Stewart River	Yukon River	644 km 400 mi	Selwyn Mountains	51000 km² 20,000 mi²	675 m³/s 23,800 ft³/s	Yukon
45	Horton River	Franklin Bay	618 km 384 mi	Kitikmeot Region, Nunavut	26680 km² 10,300 mi²		Nunavut, Northwest Territories
46	English River	Winnipeg River	615 km 382 mi	near Marmion Lake	52300 km² 20,200 mi²		Ontario
47	Pelly River	Yukon River	608 km 378 mi	Mackenzie Mountains	51000 km² 20,000 mi²	410 m³/s 14,000 ft³/s	Yukon

Works cited

Benke, Arthur C., ed., and Cushing, Colbert E., ed. Rivers of North America. Burlington, Massachusetts: Elsevier Academic Press..

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