Don River (Ontario)

Don River
The new mouth of the Don River
Location of the mouth of the Don River in Toronto
Location
Country	Canada
Province	Ontario
Cities	Toronto Markham Vaughan Richmond Hill
Physical characteristics
Source	Oak Ridges Moraine
• location	Ontario, Canada
• coordinates	43°59′20″N 79°23′57″W / 43.98889°N 79.39917°W / 43.98889; -79.39917
Mouth	Keating Channel| and the Toronto Harbour
• location	Ontario, Canada
• coordinates	43°39′4″N 79°20′51″W / 43.65111°N 79.34750°W / 43.65111; -79.34750
• elevation	75 m (246 ft)
Length	38 km (24 mi)
Basin size	360 km2 (140 sq mi)
Discharge
• location	Keating Channel and the Toronto Harbour
Basin features
Progression	Lake Ontario→ Saint Lawrence River→ Gulf of Saint Lawrence
River system	Lake Ontario drainage basin
Tributaries
• left	Taylor-Massey Creek
• right	German Mills Creek, Burke Brook, Mud Creek, Yellow Creek, Castle Frank Brook

The Don River is a watercourse in southern Ontario that empties into Lake Ontario, at Toronto Harbour. Its mouth was just east of the street grid of the town of York, Upper Canada, the municipality that evolved into Toronto, Ontario. The Don is one of the major watercourses draining Toronto (along with the Humber, and Rouge Rivers) that have headwaters in the Oak Ridges Moraine.

The Don is formed from two rivers, the East and West Branches, that meet about 7 kilometres (4 mi) north of Lake Ontario while flowing southward into the lake. The area below the confluence is known as the "lower Don", and the areas above as the "upper Don". The Don is also joined at the confluence by a third major branch, Taylor-Massey Creek. The Toronto and Region Conservation Authority (TRCA) is responsible for managing the river and its surrounding watershed.