Largest lakes & reservoirs in Thousand Islands Region, NY by shoreline length
The length of the exterior shoreline around a lake is measured at the lake’s normal elevation. The shoreline length can be considerably shorter or longer when lake water levels are lower or higher than normal. A lake with many coves has a much longer shoreline than a lake of similar surface area that is nearly circular in shape.When known, the shoreline miles that we report in our statistics include only the lake’s exterior shoreline, and exclude the shorelines of islands located within a lake’s boundaries. In lakes with many islands, those islands’ combined shorelines may exceed a lake’s exterior shoreline.
You can find many of the world’s longest-shoreline lakes on LakeLubbers. Note: For some lakes, "Longest Shorelines" data is unknown or does not apply, so this table may display fewer lakes than the total 7 articles we have published for Thousand Islands Region, NY lakes.
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Below are lakes within USA > US Mid-Atlantic Region > New York > Thousand Islands Region, NY > Compared by longest shoreline length in miles. This list does not represent all lakes in Thousand Islands Region, NY, only the 7 Thousand Islands Region, NY lake articles we have published on the LakeLubbers website.
Lake name  |
Shoreline length in miles |
Lake description |
|---|---|---|
| Lake Ontario (Canada, Finger Lakes Region, NY, Great Lakes of North America, Greater Niagara Region, NY, New York, Ontario, Canada, Thousand Islands Region, NY, US Mid-Atlantic Region, USA) |
712 mi | Lake Ontario, one of the world’s five Great Lakes, weaves over state and country borders, delighting Americans, Canadians, and visiting tourists with… |
| Black Lake NY (New York, Thousand Islands Region, NY, US Mid-Atlantic Region, USA) |
60 mi | Known as the best fishing destination in the 1000 Islands Region of upstate New York, Black Lake has been drawing anglers and vacationers to its shore… |
| Oneida Lake, NY (Central-Leatherstocking Region, NY, Finger Lakes Region, NY, New York, Thousand Islands Region, NY, US Mid-Atlantic Region, USA) |
55 mi | Covering more than 51,000 acres, Oneida Lake is the largest lake located entirely within the state of New York. Named after the Iroquois Nation Oneida… |
| Sylvia Lake (Adirondacks Region, NY, New York, Thousand Islands Region, NY, US Mid-Atlantic Region, USA) |
4 mi | Also known as Lake Killarney (historical) Tucked neatly away on the border between New York’s Adirondack and Thousand Islands regions, Sylvia Lake is the perfect Northern New York location for… |