Largest lakes & reservoirs in Philadelphia & Countryside Region, PA 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 1 articles we have published for Philadelphia & Countryside Region, PA lakes.
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Below are lakes within USA > US Mid-Atlantic Region > Pennsylvania > Philadelphia & Countryside Region, PA > Compared by longest shoreline length in miles. This list does not represent all lakes in Philadelphia & Countryside Region, PA, only the 1 Philadelphia & Countryside Region, PA lake articles we have published on the LakeLubbers website.
Lake name ![]() |
Shoreline length in miles ![]() |
Lake description |
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Lake Nockamixon, PA (Pennsylvania, Philadelphia & Countryside Region, PA, US Mid-Atlantic Region, USA) |
24 mi | Lake Nockamixon, located in the 5,283 acre Nockamixon State Park, is located in southeastern Pennsylvania’s Bucks County. The 1,450 acre reservoir is… |