Largest lakes & reservoirs in Alaska 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 24 articles we have published for Alaska lakes.
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Below are lakes within USA > US West Region > Alaska > Compared by longest shoreline length in miles. This list does not represent all lakes in Alaska, only the 24 Alaska lake articles we have published on the LakeLubbers website.
Lake name  |
Shoreline length in miles |
Lake description |
|---|---|---|
| Big Lake, AK (Alaska, Southcentral Region, AK, US West Region, USA) |
26 mi | There are over 3,000 lakes in the Mat-Su Valley, and Big Lake is one of the largest. The Mat-Su Borough, which is short for Matanuska-Susitna, is 24,0… |
| Lake Louise, AK (Alaska, Southcentral Region, AK, US West Region, USA) |
22 mi | Also known as Lake Louise State Recreation Area Lake Louise is located in the exciting Matanuska-Susitna Borough (Mat-Su for short) in Alaska. Lake Louise which connects to Susitna Lake boasts that… |
| Nancy Lake, AK (Alaska, Southcentral Region, AK, US West Region, USA) |
15 mi | Also known as Nancy Lake State Recreation Area Nancy Lake, near Willow, Alaska is part of the 22,685 acre area known as the Nancy Lake State Recreation Area. With limited development the area has r… |
| Red Shirt Lake, AK (Alaska, Southcentral Region, AK, US West Region, USA) |
13 mi | Red Shirt Lake, located in the Nancy Lake State Recreation Area in Alaska, is a remote lake that offers outdoor enthusiasts an opportunity to have an… |
| Blue Lake, AK (Alaska, Inside Passage Region, AK, US West Region, USA) |
8 mi | Also known as Blue Lake Reservoir Blue Lake, located in the Alaska Panhandle of southeastern Alaska, is for adventure seekers. The County of Sitka is known for its vistas, mountain bac… |
| Katmai Crater Lake (Alaska, Southwest Region, AK, US West Region, USA) |
6 mi | Little known and seldom seen, Katmai Crater Lake is an example of nature’s handiwork at its most impressive. Located on the Alaskan Peninsula within K… |
| Lake Lucille, AK (Alaska, Southcentral Region, AK, US West Region, USA) |
4 mi | Also known as Lucille Lake Located in the Mat-Su Valley in the heart of scenic Alaska, Lake Lucille is a small lake with a rich history. Most of Lake Lucille’s shore is privatel… |
| Cottonwood Lake, AK (Alaska, Southcentral Region, AK, US West Region, USA) |
4 mi | Cottonwood Lake, located near the town of Wasilla in the Mat-Su Valley of Alaska, is a year-round destination. The Mat-Su Valley region, short for Mat… |
| Encelewski Lake, AK (Alaska, Southcentral Region, AK, US West Region, USA) |
2 mi | Encelewski Lake, in Alaska’s Southcentral Region, is a wilderness adventurer’s dream. Neatly tucked away on the Kenai Peninsula, Encelewski Lake is le… |