Mississippi WatershedThe Mississippi River watershed is located in southeastern Ontario and is composed of a complex network of rivers, streams, rapids, and over 250 lakes.

• Drainage Area: 4450 sq. km
• General Direction Flow: Northerly
• Headwaters: Kilpecker Creek, in the Township of Addington Highlands
• Confluence: The Ottawa River in the City of Ottawa.
• Towns and Cities: 11 municipalities (Township of Addington Highlands, Township of North Frontenac, Township of Central Frontenac, Townships of Tay Valley, Township of Lanark Highlands, Township of Drummond/North Elmsley, Township of Beckwith, Town of Carleton Place, Town of Mississippi Mills, Township of Greater Madawaska, City of Ottawa).
• Total Length: 212 km in length
• Elevation: begins at an elevation of 325 m (1,066 ft) in the west and drops 252m (827 feet) gradually towards the east to an elevation of 73 m (240 ft) at the outlet to Ottawa River.