Geophysical Lake Ontario
- second smallest by volume
- average depth 283 ft. (86m)
- retention time = 6 years (a measure based on the volume of water in the lake and the mean rate of outflow)
- urban industrial centers (Hamilton and Toronto) on the Canadian side
- U.S. shore is less urbanized, not intensively farmed
Lake Ontario map from the National Oceanic and Atmospheric Administration