Seine River (Ontario)

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Seine River" Ontario – news · newspapers · books · scholar · JSTOR (August 2010) (Learn how and when to remove this message)

Seine River
Location of the mouth of the Seine River in Ontario
Etymology	Named after the Seine River in France
Location
Country	Canada
Province	Ontario
Region	Northwestern Ontario
Districts	Kenora Rainy River Thunder Bay
Physical characteristics
Source	Lac des Mille Lacs
• location	Thunder Bay District
• coordinates	48°58′46″N 90°43′49″W / 48.97944°N 90.73028°W / 48.97944; -90.73028
• elevation	457 m (1,499 ft)
Mouth	Rainy Lake
• location	Rainy River District
• coordinates	48°39′56″N 92°49′19″W / 48.66556°N 92.82194°W / 48.66556; -92.82194
• elevation	338 m (1,109 ft)
Length	240 km (150 mi)
Basin features
River system	Hudson Bay drainage basin
Tributaries
• left	Atikokan River, Mercutio River
• right	Eye River, Firesteel River

The Seine River is a river in Kenora, Rainy River and Thunder Bay Districts in northwestern Ontario, Canada. It flows 240 kilometres (149 mi) from Lac des Mille Lacs to Rainy Lake.

The river was an important route in the days of the fur trade. Gold was discovered along the river near the end of the 19th century and several mining operations established in the area. In 1943, a section of the river was diverted near Steep Rock Lake to gain access to a large iron ore deposit under the lake. That mine has since been closed. The river is used for recreational canoeing and kayaking.