This map outlines the boundaries of the 5 ocean drainage areas and the 25 drainage regions in Canada. These drainage regions cover all the land and interior freshwater lakes of Canada.
Ocean drainage areas and drainage regions
Pacific Ocean
- 101: Pacific Coastal
- 102: Fraser–Lower Mainland
- 103: Okanagan–Similkameen
- 104: Columbia
- 105: Yukon
Arctic Ocean
- 206: Peace–Athabasca
- 207: Lower Mackenzie
- 208: Arctic Coast–Islands
Gulf of Mexico
- 309: Missouri
Hudson Bay
- 410: North Saskatchewan
- 411: South Saskatchewan
- 412: Assiniboine-Red
- 413: Winnipeg
- 414: Lower Saskatchewan–Nelson
- 415: Churchill
- 416: Keewatin–Southern Baffin Island
- 417: Northern Ontario
- 418: Northern Quebec
Atlantic Ocean
- 519: Great Lakes
- 520: Ottawa
- 521: St. Lawrence
- 522: North Shore–Gaspé
- 523: Saint John–St. Croix
- 524: Maritime Coastal
- 525: Newfoundland–Labrador