Lake Ontario: The Eastern Gateway of the Great Lakes
Lake Ontario sits at the eastern end of the Great Lakes chain, straddling the USA–Canada border.
Location & Borders
- North: Ontario, Canada (Toronto, Hamilton, Kingston on north shore).
- South: New York, USA (Rochester, Oswego, Sacketts Harbor).
- Outlet: St. Lawrence River (northeast) → Atlantic Ocean.
- Inlet: Niagara River (from Lake Erie) — includes Niagara Falls.
Vital Statistics
| Metric | Value |
|---|
| Surface Area | 7,340 sq mi (19,000 km²) — 14th largest globally |
| Max Depth | 802 ft (244 m) — 2nd deepest Great Lake |
| Volume | 393 cu mi (1,640 km³) |
| Elevation | 243 ft (74 m) — lowest Great Lake |
| Retention Time | 6 years |
Ecology & Economy
- Fishery: Lake trout, salmon (stocked), walleye, bass, perch — $100M+ annual value.
- Ports: Toronto (busiest Great Lakes port), Hamilton, Rochester, Oswego — grain, steel, cement, containers.
- Recreation: Sailing, fishing, beaches (Sandbanks Provincial Park — world's largest freshwater sandbar), Toronto Islands.
- Water Supply: 9M+ people (Toronto metro, Rochester, Syracuse via pipeline).
Environmental Status
Remarkable recovery from 1960s pollution (phosphates, toxics). Challenges: invasive species (quagga mussels, round goby, sea lamprey), climate-driven water level swings, microplastics, legacy sediments. Binational management via Great Lakes Water Quality Agreement (IJC).
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