Largest lakes & reservoirs in US Southwest Region 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 149 articles we have published for US Southwest Region lakes.
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Below are lakes within USA > US Southwest Region > Compared by longest shoreline length in miles. This list does not represent all lakes in US Southwest Region, only the 149 US Southwest Region lake articles we have published on the LakeLubbers website.
Lake name  |
Shoreline length in miles |
Lake description |
|---|---|---|
| Lake Powell, AZ/UT (Arizona, Canyonlands Region, UT, Color Country, UT, North Central Arizona, US Southwest Region, US West Region, USA, Utah) |
1,900 mi | Lake Powell is located in one of Southern Utah’s most picturesque red-rock desert areas and in Arizona’s Navajo Indian Reservation. It is one of the U… |
| Grand Lake O’the Cherokees, OK (Green Country, OK, Oklahoma, US Southwest Region, USA) |
1,300 mi | Also known as Grand Lake Over the Cherokees Grand Lake O’ the Cherokees stands out as a sapphire jewel tucked into the northeastern Oklahoma landscape. Created in 1940, the reservoir stretches f… |
| Toledo Bend Reservoir, LA/TX (Crossroads Region, LA, Louisiana, Piney Woods Region, TX, Texas, US South Region, US Southwest Region, USA) |
1,264 mi | Also known as Toledo Bend Lake A grand experience is assured in visiting Toledo Bend Reservoir, renowned as the largest man-made aquatic body in the southern United States. Cradled… |
| Lake Amistad, TX / Mexico (Hill Country Region, TX, Mexico, North Mexico, Texas, US Southwest Region, USA) |
851 mi | Also known as International Amistad Reservoir The Spanish word “Amistad” translates to “Friendship” in English … little wonder, then, that west Texas’ Lake Amistad is one of the Lone Star State’… |
| Eufaula Lake, OK (Green Country, OK, Kiamichi Country, OK, Oklahoma, US Southwest Region, USA) |
600 mi | Also known as Lake Eufaula Spanning 105,000 acres, Eufaula Lake covers much of McIntosh and Pittsburg Counties in eastern Oklahoma. This “Gentle Giant” is the largest lake in su… |
| Lake Texoma, OK/TX (Arbuckle Country, OK, Oklahoma, Prairies and Lakes Region, TX, Texas, US Southwest Region, USA) |
580 mi | Also known as Texoma Lake An 89,000-acre jewel set into the landscape of Texas and Oklahoma, Lake Texoma is a sparkling wonder of deep blue water and beautiful green shores. Wi… |
| Sam Rayburn Reservoir, TX (Piney Woods Region, TX, Texas, US Southwest Region, USA) |
560 mi | Also known as Lake Sam Rayburn, McGee Bend Reservoir Sam Rayburn Reservoir, lovingly called “Big Sam”, and formerly known as McGee Bend Reservoir, is the largest lake which lies completely within Texas.… |
| Lake Mead, AZ/NV (Arizona, Las Vegas Territory, NV, Nevada, US Southwest Region, US West Region, USA, West Coast Region, AZ) |
550 mi | Lake Mead is the USA’s largest man-made reservoir in amount of water it can hold. Although Lake Powell is marginally larger in acreage at full-pond, L… |
| Lake Livingston, TX (Piney Woods Region, TX, Texas, US Southwest Region, USA) |
450 mi | Also known as Livingston Reservoir Sometimes referred to as a “water wonderland,” Lake Livingston is the second largest lake contained entirely within Texas. With over 450 miles of shor… |
| Lake Havasu, AZ/CA (Arizona, California, Desert Region, CA, US Southwest Region, US West Region, USA, West Coast Region, AZ) |
450 mi | Lake Havasu’s 20,400 acres, formed behind Parker Dam on the Colorado River, is a boating paradise. Around Lake Havasu City, the most recognizable sigh… |
| Richland Chambers Lake, TX (Prairies and Lakes Region, TX, Texas, US Southwest Region, USA) |
330 mi | Also known as Richland Chambers Reservoir Richland Chambers Lake (also called Richland Chambers Reservoir) was created between 1982 to 1987, making it the youngest lake in Texas. The Texas leg… |
| Keystone Lake, OK (Green Country, OK, Oklahoma, US Southwest Region, USA) |
330 mi | Keystone Lake is an impressive 26,000-acre recreational gem located in north-central Oklahoma, just 15 miles west of Tulsa. Natural beauty surrounds t… |