Largest lakes & reservoirs in Maryland 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 8 articles we have published for Maryland lakes.
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Below are lakes within USA > US Mid-Atlantic Region > Maryland > Compared by longest shoreline length in miles. This list does not represent all lakes in Maryland, only the 8 Maryland lake articles we have published on the LakeLubbers website.
Lake name  |
Shoreline length in miles |
Lake description |
|---|---|---|
| Liberty Reservoir, MD (Central Maryland, Maryland, US Mid-Atlantic Region, USA) |
82 mi | Also known as Liberty Lake Liberty Reservoir, also known as Liberty Lake, is located in the Patapsco region of the Chesapeake Bay watershed within Maryland’s Baltimore suburbs. … |
| Deep Creek Lake, MD (Maryland, US Mid-Atlantic Region, USA, Western Maryland) |
65 mi | Deep Creek Lake is the largest inland body of water in Maryland, covering about 3,900 acres in the Allegheny Mountains of western Maryland. Since its … |
| Prettyboy Reservoir, MD (Central Maryland, Maryland, US Mid-Atlantic Region, USA) |
46 mi | Prettyboy Reservoir spreads out over 1,500 acres in northern Baltimore County, Maryland. It is named after Prettyboy Creek, which is a located in a se … |
| Loch Raven Reservoir, MD (Central Maryland, Maryland, US Mid-Atlantic Region, USA) |
39 mi | The Loch Raven Reservoir is located just a few miles north of Baltimore. Unspoiled and surrounded by forests and hiking trails, it has long provided M … |
| Little Seneca Lake, MD (Capital Region, MD, Maryland, US Mid-Atlantic Region, USA) |
16 mi | Little Seneca Lake, located near Boyds, Maryland, is the focal point of the Black Hill Regional Park and covers nearly 1/3 of its acreage. It lies in … |
| Savage River Reservoir, MD (Maryland, US Mid-Atlantic Region, USA, Western Maryland) |
16 mi | Fresh, crystal clear mountain water makes Savage River Reservoir a beautiful destination in northwestern Maryland. Located in a canyon of the Savage R … |
| Jennings Randolph Lake, MD/WV (Maryland, Potomac Highlands Region, WV, US Mid-Atlantic Region, US South Region, USA, West Virginia, Western Maryland) |
14 mi | Also known as Jennings Randolph Reservoir, Bloomington Lake Jennings Randolph Lake is nestled in a scenic valley along the North Branch Potomac River. This portion of the Potomac creates the county and state bo … |
| Lake Needwood & Lake Frank (Capital Region, MD, Maryland, US Mid-Atlantic Region, USA) |
3 mi | Also known as Needwood Reservoir, Lake Bernard Frank, Bernard Frank Reservoir Lake Needwood and its little neighbor, Lake Bernard Frank, offer a quiet respite from the busy, noisy metropolitan Washington DC landscape. The little … |