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South Nation River
South Nation River.JPG
South Nation River at Plantagenet
Country Canada
Province Ontario
Region Eastern Ontario
Physical characteristics
Main source Near Fairfield East, Leeds and Grenville County
River mouth Ottawa River
2 km east of Wendover, Prescott and Russell County
45 m (148 ft)
Length 175 km (109 mi)
Basin features
Progression Ottawa RiverSaint Lawrence RiverGulf of Saint Lawrence
River system Ottawa River drainage basin
Basin size 3,900 km2 (1,500 sq mi)
Chesterville ON
The South Nation River at Chesterville

The South Nation River is a river in Eastern Ontario, Canada. It springs from forests and marshes located north of Brockville and it flows 175 kilometres (109 mi) northeast to empty into the Ottawa River north of Plantagenet. Its watershed covers 3,900 square kilometres (1,500 sq mi).

This river is called the "South Nation River" to distinguish it from a river in Quebec north of the Ottawa River called the Petite-Nation River or rivière Petite-Nation. The names of both rivers are derived from the French name for the native people of this area, the Weskarini.

The area surrounding the river, originally covered with white pine, is now mainly used for agriculture. The river drains an almost flat plain, and its lack of gradient makes it prone to flooding. Dams and other water control measures have been introduced to help reduce the impact of seasonal flooding in the watershed.

In some areas the river flows through Leda clays which can be very unstable. Several landslides have occurred over the past century including a major one near the former town of Lemieux on June 20, 1993. Approximately 3 million cubic metres (110,000,000 cu ft) of mud and clay slid into the river valley, blocking the river's flow for three days.

Four kilometers of river to the south of Spencerville is good for canoeing during most water conditions. There is a public boat launch at the old mill.

Tributaries

(in downstream order)

  • North Branch South Nation River
  • Sandy Creek
  • Payne River
  • various branches of the Castor River
  • Moose Creek
  • Bear Brook
  • Scotch River
  • Caledonia Creek

Communities

(in downstream order)

  • Spencerville
  • South Mountain
  • Chesterville
  • Crysler
  • St. Albert
  • Casselman
  • Plantagenet
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