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The World’s 25 Largest Lakes, Side by Side
The World’s 25 Largest Lakes, Side by Side
In many parts of the world, you don’t have to look very far to find a lake.
According to satellite data, there are roughly 100 million lakes larger than one hectare (2.47 acres) to be found globally. The largest lakes, which rival the size of entire nations, are more of a rarity.
One might expect the world’s largest lakes to be very alike, but from depth to saline content, their properties can be quite different. As well, the ranking of the world’s largest lakes is far from static, as human activity can turn a massive body of water into a desert within a single generation.
Today’s graphic – created using the fantastic online tool, Slap It On A Map! – uses the Great Lakes region as a point of comparison for the largest 25 lakes, by area. This is particularly useful in comparing the scale of lakes that are located in disparate parts of the globe.
The Greatest Lakes
The largest lake in the world by a long shot is the Caspian Sea – a name that hints at a past when it was contiguous with the ocean around 11 million years ago. This massive saline lake, which is nearly the same size as Japan, borders five countries: Kazakhstan, Russia, Turkmenistan, Azerbaijan, and Iran. An estimated 48 billion barrels of oil lay beneath the surface of the basin.
The five Great Lakes, which run along the Canada–U.S. border, form one of the largest collections of fresh water on Earth. This interconnected series of lakes represents around 20% of the world’s fresh water and the region supports over 100 million people, roughly equal to one-third of the Canada–U.S. population.
Amazingly, a single lake holds as much fresh water as all the Great Lakes combined – Lake Baikal. This rift lake in Siberia has a maximum depth of 5,371ft (1,637m). For comparison, the largest of the Great Lakes (Lake Superior) is only 25% as deep, with a maximum depth of 1,333ft (406m). Lake Baikal is unique in a number of other ways too. It is the world’s oldest, coldest lake, and around 80% of its animal species are endemic (not found anywhere else).
Here’s a full run-down of the top 25 lakes by area:
Rank | Lake Name | Surface Area | Type | Countries on shoreline |
---|---|---|---|---|
1 | Caspian Sea | 143,000 sq mi (371,000km²) | Saline | 🇰🇿 Kazakhstan 🇷🇺 Russia 🇹🇲 Turkmenistan 🇦🇿 Azerbaijan 🇮🇷 Iran |
2 | Superior | 31,700 sq mi (82,100km²) | Freshwater | 🇨🇦 Canada 🇺🇸 U.S. |
3 | Victoria | 26,590 sq mi (68,870km²) | Freshwater | 🇺🇬 Uganda 🇰🇪 Kenya 🇹🇿 Tanzania |
4 | Huron | 23,000 sq mi (59,600km²) | Freshwater | 🇨🇦 Canada 🇺🇸 U.S. |
5 | Michigan | 22,000 sq mi (58,000km²) | Freshwater | 🇺🇸 U.S. |
6 | Tanganyika | 12,600 sq mi (32,600km²) | Freshwater | 🇧🇮 Burundi 🇹🇿 Tanzania 🇿🇲 Zambia 🇨🇩 D.R.C. |
7 | Baikal | 12,200 sq mi (31,500km²) | Freshwater | 🇷🇺 Russia |
8 | Great Bear Lake | 12,000 sq mi (31,000km²) | Freshwater | 🇨🇦 Canada |
9 | Malawi | 11,400 sq mi (29,500km²) | Freshwater | 🇲🇼 Malawi 🇲🇿 Mozambique 🇹🇿 Tanzania |
10 | Great Slave Lake | 10,000 sq mi (27,000km²) | Freshwater | 🇨🇦 Canada |
11 | Erie | 9,900 sq mi (25,700km²) | Freshwater | 🇨🇦 Canada 🇺🇸 U.S. |
12 | Winnipeg | 9,465 sq mi (24,514km²) | Freshwater | 🇨🇦 Canada |
13 | Ontario | 7,320 sq mi (18,960km²) | Freshwater | 🇨🇦 Canada 🇺🇸 U.S. |
14 | Ladoga | 7,000 sq mi (18,130km²) | Freshwater | 🇷🇺 Russia |
15 | Balkhash | 6,300 sq mi (16,400km²) | Saline | 🇰🇿 Kazakhstan |
16 | Vostok | 4,800 sq mi (12,500km²) | Freshwater | 🇦🇶 Antarctica |
17 | Onega | 3,700 sq mi (9,700km²) | Freshwater | 🇷🇺 Russia |
18 | Titicaca | 3,232 sq mi (8,372km²) | Freshwater | 🇧🇴 Bolivia 🇵🇪 Peru |
19 | Nicaragua | 3,191 sq mi (8,264km²) | Freshwater | 🇳🇮 Nicaragua |
20 | Athabasca | 3,030 sq mi (7,850km²) | Freshwater | 🇨🇦 Canada |
21 | Taymyr | 2,700 sq mi (6,990km²) | Freshwater | 🇷🇺 Russia |
22 | Turkana | 2,473 sq mi (6,405km²) | Saline | 🇰🇪 Kenya 🇪🇹 Ethiopia |
23 | Reindeer Lake | 2,440 sq mi (6,330km²) | Freshwater | 🇨🇦 Canada |
24 | Issyk-Kul | 2,400 sq mi (6,200km²) | Saline | 🇰🇬 Kyrgyzstan |
25 | Urmia | 2,317 sq mi (6,001km²) | Saline | 🇮🇷 Iran |
The Great Lakes World Tour
For people living in Canada and the U.S., the shape and relative size of the Great Lakes system may be quite familiar. This makes the Great Lakes a fantastic point of comparison to help put the size of other world locations into perspective. To this end, we begin our Great Lakes World Tour.
First, the image below shows how the Great Lakes system would look if it was located in India.
Distortions on commonly used maps can downplay the size of India compared to more northern nations. This view of the Great Lakes can help put India’s true size into perspective.
Next, we look at the Great Lakes overlaid within Central Europe.
In the context of Europe, the lakes are so large that they extend from the Netherlands over to Slovakia. Lake Superior’s surface area of 31,700 mi2 (82,000 km2), is similar in size to Austria. Here’s are the five Great Lakes and European countries of equivalent size:
Great Lakes | Surface Area | Equivalent Country | Area |
---|---|---|---|
Lake Superior | 82,000 km2 (31,700 sq mi) | 🇦🇹 Austria | 83,879 km2 (32,386 sq mi) |
Lake Huron | 60,000 km2 (23,000 sq mi) | 🇱🇻 Latvia | 64,589 km2 (24,938 sq mi) |
Lake Michigan | 58,000 km2 (22,300 sq mi) | 🇭🇷 Croatia | 56,594 km2 (21,851 sq mi) |
Lake Erie | 25,700 km2 (9,910 sq mi) | 🇲🇰 North Macedonia | 25,713 km2 (9,928 sq mi) |
Lake Ontario | 19,000 km2 (7,340 sq mi) | 🇸🇮 Slovenia | 20,271 km2 (7,827 sq mi) |
Lastly, here is a look at the Great Lakes in Southern Australia. Australia is the world’s 6th largest country, so the Great Lakes only occupy one corner of its land mass.
Australia’s lack of glacial history means that there are few permanent freshwater lakes in the country. Many of the country’s largest lakes only fill up during periods of excessive rainfall.
Shrinking out of the rankings
Not far from the world’s largest lake, straddling the border between Kazakhstan and Uzbekistan, lay the sand dunes of the Aralkum Desert. In the not so distant past, this harsh environment was actually the bed of one of the largest lakes in the world – the Aral Sea.
For reasons both climatic and anthropogenic, the Aral Sea began receding in the 1960s. This dramatic change in surface area took the Aral Sea from the fourth largest lake on Earth to not even ranking in the top 50. Researchers note that the size of the lake has fluctuated a lot over history, but through the lens of modern history these recent changes happened rapidly, leaving local economies devastated and former shoreside towns landlocked.
Lake Chad, in Saharan Africa, and Lake Urmia, in Iran, both face similar challenges, shrinking dramatically in recent decades.
How we work to reverse damage and avoid ecosystem collapse in vulnerable lakes will have a big influence on how the top 25 list may look in future years.
Environment
The Most Polluted Cities in the U.S.
What are the most polluted cities in the U.S. according to data from the American Lung Association’s 2024 State of the Air Report?
The Most Polluted U.S. Cities in 2024
According to the World Health Organization, air pollution is responsible for 7 million deaths annually, and could cost the global economy between $18–25 trillion by 2060 in annual welfare costs, or roughly 4–6% of world GDP.
And with predictions that 7 in 10 people will make their homes in urban centers by mid-century, cities are fast becoming one of the frontlines in the global effort to clear the air.
In this visualization, we use 2024 data from the State of the Air report from the American Lung Association to show the most polluted cities in the United States.
What is Air Pollution?
Air pollution is a complex mixture of gases, particles, and liquid droplets and can have a variety of sources, including wildfires and cookstoves in rural areas, and road dust and diesel exhaust in cities.
There are a few kinds of air pollution that are especially bad for human health, including ozone and carbon monoxide, but here we’re concerned with fine particulate matter that is smaller than 2.5 microns, or PM2.5 for short.
The reason for the focus is because at that small size, particulate matter can penetrate the bloodstream and cause all manner of havoc, including cardiovascular disease, lung cancer, and chronic pulmonary disease.
The American Lung Association has set an annual average guideline of 9 µg/m³ for PM2.5, however, the World Health Organization has set a much more stringent limit of 5 µg/m³.
The 21 Worst Polluted Cities in the U.S.
Here are the top 21 most polluted cities in the U.S., according to their annual average PM2.5 concentrations:
Rank | City, State | Annual average concentration, 2020-2022 (µg/m3) |
---|---|---|
1 | Bakersfield, CA | 18.8 |
2 | Visalia, CA | 18.4 |
3 | Fresno, CA | 17.5 |
4 | Eugene, OR | 14.7 |
5 | Bay Area, CA | 14.3 |
6 | Los Angeles, CA | 14.0 |
7 | Sacramento, CA | 13.8 |
8 | Medford, OR | 13.5 |
9 | Pheonix, AZ | 12.4 |
10 | Fairbanks, AK | 12.2 |
11 | Indianapolis, IN | 11.9 |
12 | Yakima, WA | 11.8 |
13 | Detroit, MI | 11.7 |
T14 | Chico, CA | 11.6 |
T14 | Spokane, WA | 11.6 |
15 | Houston, TX | 11.4 |
16 | El Centro, CA | 11.1 |
17 | Reno, NV | 11.0 |
18 | Pittsburgh, PA | 10.9 |
T19 | Kansas City, KS | 10.8 |
T19 | Las Vegas, NV | 10.8 |
Note: The American Lung Association uses Core Based Statistical Areas in its city and county rankings, which have been shortened here to the area’s principal city, or metro area in the case of the Bay Area, CA.
Six of the top seven cities are in California, and four in the state’s Central Valley, a 450-mile flat valley that runs parallel to the Pacific coast, and bordered by the Coast and Sierra Nevada mountain ranges. As a result, when pollution from the big population centers on the coast is carried inland by the wind—cities #5 and #6 on the list—it tends to get trapped in the valley.
Bakersfield (#1), Visalia (#2), and Fresno (#3) are located at the drier and hotter southern end of the valley, which is worse for air quality. The top three local sources of PM2.5 emissions in 2023 were farms (20%), forest management / agricultural waste burning (20%), and road dust (14%).
Benefit to Economy
While the health impacts are generally well understood, less well known are the economic impacts.
Low air quality negatively affects worker productivity, increases absenteeism, and adds both direct and indirect health care costs. But the flip side of that equation is that improving air quality has measurable impacts to the wider economy. The EPA published a study that calculated the economic benefits of each metric ton of particulate matter that didn’t end up in the atmosphere, broken down by sector.
Sector | Benefits per metric ton |
---|---|
Residential Woodstoves | $429,220 |
Refineries | $333,938 |
Industrial Boilers | $174,229 |
Oil and Natural Gas Transmission | $125,227 |
Electricity Generating Units | $124,319 |
Oil and Natural Gas | $88,838 |
At the same time, the EPA recently updated a cost-benefit analysis of the Clean Air Act, the main piece of federal legislation governing air quality, and found that between 1990 and 2020 it cost the economy roughly $65 billion, but also provided $2 trillion in benefits.
Benefit to Business
But that’s at the macroeconomic level, so what about for individual businesses?
For one, employees like to breathe clean air and will choose to work somewhere else, given a choice. A 2022 Deloitte case study revealed that nearly 70% of highly-skilled workers said air quality was a significant factor in choosing which city to live and work in.
At the same time, air quality can impact employer-sponsored health care premiums, by reducing the overall health of the risk pool. And since insurance premiums averaged $7,590 per year in 2022 for a single employee, and rose to $21,931 for a family, that can add up fast.
Consumers are also putting their purchase decisions through a green lens, while ESG, triple-bottom-line, and impact investing are putting the environment front and center for many investors.
And if the carrot isn’t enough for some businesses, there is the stick. The EPA recently gave vehicle engine manufacturer Cummins nearly two billion reasons to help improve air quality, in a settlement the agency is calling “the largest civil penalty in the history of the Clean Air Act and the second largest environmental penalty ever.”
Learn how the National Public Utilities Council is working toward the future of sustainable electricity.
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