Largest lakes & reservoirs in Pennsylvania 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 40 articles we have published for Pennsylvania lakes.
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Below are lakes within USA > US Mid-Atlantic Region > Pennsylvania > Compared by longest shoreline length in miles. This list does not represent all lakes in Pennsylvania, only the 40 Pennsylvania lake articles we have published on the LakeLubbers website.
Lake name  |
Shoreline length in miles |
Lake description |
|---|---|---|
| Lake Erie (Canada, Chautauqua-Allegheny Region, NY, Great Lakes Region, PA, Great Lakes of North America, Greater Niagara Region, NY, Michigan, New York, Northeast Ohio, Northwest Ohio, Ohio, Ontario, Canada, Pennsylvania, Southeast Michigan, US Mid-Atlantic Region, US Midwest Region, USA) |
871 mi | Lake Erie, one of the Great Lakes of North America, straddles the borders of Ohio, Pennsylvania, New York, Michigan, and the Canadian province of Onta… |
| Raystown Lake, PA (Allegheny Mountains & Valleys Region, PA, Pennsylvania, US Mid-Atlantic Region, USA) |
110 mi | Raystown Lake, at 8,300 acres, is the largest lake located entirely within Pennsylvania’s borders. The lake is nestled in the southern Allegheny Mount… |
| Allegheny Reservoir, NY/PA (Chautauqua-Allegheny Region, NY, New York, Pennsylvania, Pennsylvania Wilds Region, US Mid-Atlantic Region, USA) |
91 mi | Also known as Kinzua Dam Lake, Kinzua Lake, Lake Kinzua Flowing across tree-covered hills in northwestern Pennsylvania and southwestern New York, the Allegheny Reservoir’s 12,080 acres provide an open invit… |
| Pymatuning Lake, PA/OH (Great Lakes Region, PA, Northeast Ohio, Ohio, Pennsylvania, US Mid-Atlantic Region, US Midwest Region, USA) |
70 mi | Also known as Pymatuning Reservoir Pymatuning Lake, located in northwestern Pennsylvania and spilling over into northeastern Ohio, is a lake of superlatives: Clocking in at 17,088 acres… |
| Lake Wallenpaupack, PA (Northeastern Mountains Region, PA, Pennsylvania, US Mid-Atlantic Region, USA) |
52 mi | Lake Wallenpaupack is a prime recreation destination in northeast Pennsylvania’s Pocono Mountains region, nestled among the counties of Hawley, Pike,… |
| Lake Arthur, PA (Pennsylvania, Pittsburgh & Countryside Region, PA, US Mid-Atlantic Region, USA) |
42 mi | In the warm summer breeze, sailboats dart like flocks of colorful birds across Lake Arthur’s clear Pennsylvania waters. Located in Butler County, this… |
| Lake Marburg (Pennsylvania, Pennsylvania Dutch Country Region, US Mid-Atlantic Region, USA) |
26 mi | Also known as Codorus Lake Pennsylvania Dutch Country near Hanover, Pennsylvania holds a spectacular recreational resource called Lake Marburg. This 1,300-acre reservoir combine… |
| 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… |
| Beltzville Lake, PA (Northeastern Mountains Region, PA, Pennsylvania, US Mid-Atlantic Region, USA) |
20 mi | Also known as Beltzville Reservoir The Pennsylvania Pocono Mountains are spectacular for many reasons, and Beltzville Lake is one of them. Located in the southern foothills of these fam… |
| Indian Lake, PA (Pennsylvania, Pittsburgh & Countryside Region, PA, US Mid-Atlantic Region, USA) |
20 mi | Indian Lake is a freshwater man-made lake shaped like a horseshoe, located in Somerset County, Pennsylvania. It is part of the state’s Laurel Highland… |
| Cowanesque Lake, PA (Pennsylvania, Pennsylvania Wilds Region, US Mid-Atlantic Region, USA) |
17 mi | Peacefully nestled between forested ridges in north central Pennsylvania lies Cowanesque Lake. Located near the New York state line, the name Cowanesq… |
| Youghiogheny River Lake (Pennsylvania, Pittsburgh & Countryside Region, PA, US Mid-Atlantic Region, USA) |
16 mi | Also known as Yough Lake In the heart of the Laurel Highlands and spanning the Mason-Dixon Line between Pennsylvania and Maryland lays Youghiogheny River Lake. The U.S. Army C… |