Lake Michigan is one of the largest freshwater lakes in the world, covering about 22,300 square miles (57,750 square kilometers). Its enormous surface area makes it comparable in size to some of the smaller seas found around the world.
Although most major seas are much larger than Lake Michigan, a few named seas have smaller surface areas. Comparing them with Lake Michigan gives a clearer sense of just how large this Great Lake really is.
So, is Lake Michigan bigger than any seas? The answer becomes clear when its surface area is compared directly with the smaller seas.
Table of Contents
Quick Reference: Lake Michigan Compared With Smaller Seas
| Body of Water | Approx. Surface Area | Location | Classification |
|---|---|---|---|
| Lake Michigan | 22,300 sq mi | United States | Freshwater lake |
| Sea of Marmara | 4,382 sq mi | Turkey | Inland sea |
| Sea of Azov | 15,000 sq mi | Ukraine and Russia | Marginal sea |
| Alboran Sea | About 20,000 sq mi | Spain, Morocco, and Algeria | Marginal sea |
| Bali Sea | About 17,400 sq mi | Indonesia | Marginal sea |
| Seto Inland Sea | About 9,000 sq mi | Japan | Inland sea |
Lake Michigan is larger in surface area than each of the bodies of water listed above. Exact figures can vary slightly depending on how the boundaries of each sea are defined.
Is Lake Michigan Bigger Than the Sea of Marmara?
Yes. Lake Michigan is much larger than the Sea of Marmara by surface area. Lake Michigan covers about 22,300 square miles, while the Sea of Marmara covers approximately 4,382 square miles.
This means Lake Michigan has roughly five times the surface area of the Sea of Marmara. The difference is especially notable because the Sea of Marmara is a recognized inland sea, while Lake Michigan is a freshwater lake within the Great Lakes system.
The Sea of Marmara is located entirely within Turkey and connects the Black Sea with the Aegean Sea through the Bosporus and Dardanelles. Despite its relatively small size compared with many other seas, it plays an important role in the regional waterway between Europe and Asia.
By surface area, therefore, Lake Michigan is substantially larger than the Sea of Marmara. The comparison also shows why Lake Michigan’s size can give it a sea-like scale despite its classification as a lake.
Is Lake Michigan Bigger Than the Sea of Azov?
Yes. Lake Michigan is larger than the Sea of Azov by surface area, although the difference is much smaller than the comparison with the Sea of Marmara. Lake Michigan covers about 22,300 square miles, while the Sea of Azov covers approximately 15,000 square miles.
The difference is about 7,300 square miles, meaning Lake Michigan has roughly 1.5 times the surface area of the Sea of Azov. While their surface areas are relatively close compared with some other seas, Lake Michigan still occupies substantially more area.
The Sea of Azov lies between southern Ukraine and southwestern Russia and is connected to the Black Sea through the narrow Kerch Strait. It is known for being extremely shallow, with an average depth of only about 23 feet and a maximum depth of roughly 46 feet.
Lake Michigan is considerably deeper and has a very different physical setting. It is one of North America’s Great Lakes and is connected to the other Great Lakes through a network of waterways. Despite being a freshwater lake rather than a sea, its surface area exceeds that of the Sea of Azov.
Is Lake Michigan Bigger Than the Alboran Sea?
Yes. Lake Michigan is slightly larger than the Alboran Sea by surface area. Lake Michigan covers about 22,300 square miles, while the Alboran Sea covers roughly 20,000 square miles.
The difference is relatively small compared with some of the other comparisons in this article. Lake Michigan is about 2,300 square miles larger, or roughly 11% larger than the Alboran Sea.
The Alboran Sea is the westernmost part of the Mediterranean Sea, lying between southern Spain and northern Morocco and extending toward Algeria. It is a true marine body of water and is connected to the western Mediterranean through the Strait of Gibraltar.
Although Lake Michigan is classified as a freshwater lake, its surface area is large enough to exceed that of the Alboran Sea. This is one of the closer size comparisons between Lake Michigan and a recognized sea.
Is Lake Michigan Bigger Than the Bali Sea?
Yes. Lake Michigan is larger than the Bali Sea by surface area. Lake Michigan covers about 22,300 square miles, while the Bali Sea covers roughly 17,400 square miles.
That makes Lake Michigan about 4,900 square miles larger, or roughly 30% larger than the Bali Sea. The difference is smaller than the gap between Lake Michigan and the Sea of Marmara, but Lake Michigan still has a noticeably larger surface area.
The Bali Sea lies north of the island of Bali and forms part of the network of seas surrounding Indonesia’s many islands. It is a marine body of water connected to other regional seas through passages between the islands.
Lake Michigan, in contrast, is a freshwater lake within the Great Lakes system. Despite the difference in salinity and geographic setting, its surface area is greater than that of the Bali Sea, showing how large Lake Michigan is compared with some named seas.
Is Lake Michigan Bigger Than the Seto Inland Sea?
Yes. Lake Michigan is considerably larger than the Seto Inland Sea by surface area. Lake Michigan covers about 22,300 square miles, while the Seto Inland Sea covers approximately 9,000 square miles.
Lake Michigan therefore has roughly 2.5 times the surface area of the Seto Inland Sea. The difference is substantial, placing the Seto Inland Sea well below Lake Michigan in terms of surface area.
The Seto Inland Sea is located in Japan between the islands of Honshu, Shikoku, and Kyushu. Unlike an open sea, it is a relatively enclosed body of saltwater surrounded by islands and connected to the Pacific Ocean through several passages.
Lake Michigan has a completely different setting and is freshwater, but its surface area is more than twice that of the Seto Inland Sea. This comparison further illustrates the unusually large scale of Lake Michigan among the world’s named seas and inland seas.
Why Is Lake Michigan Considered a Lake Despite Its Sea-Like Size?
Lake Michigan is classified as a lake because it is a freshwater body within the Great Lakes system. Its classification is based on its geographic and hydrologic characteristics, not simply its surface area.
Lake Michigan is connected to Lake Huron through the Straits of Mackinac, and together they function as a single hydrologic system. Water ultimately flows through the Great Lakes toward the Atlantic Ocean via the St. Lawrence River, but Lake Michigan itself remains a freshwater lake.
Its enormous size can make it look and behave somewhat like an inland sea. Strong winds can create large waves, and the opposite shoreline may disappear from view on a clear day. However, these sea-like characteristics do not change its geographic classification.
The comparison with smaller seas shows why Lake Michigan can seem unusual. At about 22,300 square miles, it is larger in surface area than several named seas, yet it remains a freshwater lake because of its physical setting, water characteristics, and connection to the Great Lakes system.
Conclusion
Lake Michigan covers about 22,300 square miles, making it larger by surface area than several named seas, including the Sea of Marmara, Sea of Azov, Alboran Sea, Bali Sea, and Seto Inland Sea.
These comparisons highlight the enormous scale of Lake Michigan. Despite being a freshwater lake, its surface area exceeds that of several marine and inland seas around the world.
Lake Michigan is still classified as a lake because of its freshwater character and its geographic and hydrologic relationship with the other Great Lakes. Its size may give it a sea-like appearance, but its classification is based on more than surface area alone.