Lake Ontario topographic map
Interactive map
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Lake Ontario
Lake Ontario is the easternmost of the Great Lakes and the smallest in surface area (7,340 sq mi, 18,960 km2), although it exceeds Lake Erie in volume (393 cu mi, 1,639 km3). It is the 13th largest lake in the world. When its islands are included, the lake's shoreline is 712 miles (1,146 km) long. As the last lake in the Great Lakes' hydrologic chain, Lake Ontario has the lowest mean surface elevation of the lakes at 243 feet (74 m) above sea level; 326 feet (99 m) lower than its neighbor upstream. Its maximum length is 193 statute miles (311 kilometres; 168 nautical miles), and its maximum width is 53 statute miles (85 km; 46 nmi). The lake's average depth is 47 fathoms 1 foot (283 ft; 86 m), with a maximum depth of 133 fathoms 4 feet (802 ft; 244 m). The lake's primary source is the Niagara River, draining Lake Erie, with the Saint Lawrence River serving as the outlet. The drainage basin covers 24,720 square miles (64,030 km2). As with all the Great Lakes, water levels change both within the year (owing to seasonal changes in water input) and among years (owing to longer-term trends in precipitation). These water level fluctuations are an integral part of lake ecology and produce and maintain extensive wetlands. The lake also has an important freshwater fishery, although it has been negatively affected by factors including overfishing, water pollution and invasive species.
About this map
Name: Lake Ontario topographic map, elevation, terrain.
Location: Lake Ontario, Ontario, Canada (43.15936 -79.92529 44.29337 -76.04535)
Average elevation: 702 ft
Minimum elevation: 230 ft
Maximum elevation: 2,293 ft
Other topographic maps
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Slate Islands
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Canada > Ontario > Nipissing District > Unorganized South Nipissing
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Berwick
Canada > Ontario > Stormont, Dundas and Glengarry Counties > North Stormont
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Quadeville
Canada > Ontario > Renfrew County > Brudenell, Lyndoch and Raglan
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Hubbard Creek
Canada > Ontario > Sudbury District > Unorganized North Sudbury
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Ellsmere Island
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Canada > Ontario > Stormont, Dundas and Glengarry Counties > North Glengarry
Average elevation: 295 ft
Cockburn Island
Canada > Ontario > Leeds and Grenville Counties > Elizabethtown-Kitley
Average elevation: 367 ft
Iroquois
Canada > Ontario > Stormont, Dundas and Glengarry Counties > South Dundas
Average elevation: 272 ft
St. Helena Island
Canada > Ontario > Leeds and Grenville Counties > Front of Yonge
Average elevation: 377 ft
Edison Lake
Canada > Ontario > Kenora District > Unorganized Kenora District
Average elevation: 1,263 ft
