Have you ever wondered which country has the most lakes in the world? Is it China? Russia? or the USA? It is none of them. The answer is Canada.
Canada is famous for having more lakes than the rest of the world combined. With over two million lakes, they cover about 9% of the country’s total surface.
In fact, Canada holds nearly 20% of the world’s fresh water. From small ponds to massive bodies of water like Great Bear Lake, the country is a true water paradise. But why does Canada have so much water?
The Power of the Ice Age
About 2.6 million years ago, during the Quaternary Ice Age, a massive ice sheet called the Laurentide ice sheet covered almost all of Canada. This ice was incredibly heavy and thick, reaching up to 3 kilometers deep in some places.
As this giant ice sheet crawled across the land, it worked like massive sandpaper. The ice literally froze onto huge rocks, ripped them out of the ground, and crushed everything in its path.
Furthermore, when the climate warmed up about 10,000 to 18,000 years ago, these glaciers started to melt and retreat. They left behind a transformed landscape full of deep holes and basins. The melting ice released enormous amounts of water, filling these new holes and creating millions of lakes.
Many parts of the world were once covered by ice, but Canada has more lakes because of a geological feature called the Canadian Shield. This is a massive area of very old rock that stretches across nearly half of the country. The Shield is made of extremely hard crystalline rocks like granite.
Unlike softer ground, these hard rocks are impermeable, meaning water cannot soak into them. Additionally, the moving glaciers scraped away most of the soil, leaving only a thin layer.
This turned the region into a giant rocky bowl where water has nowhere to go. Because the old river systems were destroyed by the ice, the water simply pools on top of the hard rock instead of flowing away.
How the Ground and Ice Created the Lakes
In northern Canada, the ground is frozen all year round. Because the ground is hard like a wall, water cannot soak into the dirt, so it just stays on the surface and forms lakes.
There are also unique round lakes called "kettle lakes." Long ago, huge chunks of ice got buried under sand. When that ice finally melted, the ground left a big hole that filled up with water, making a perfect round lake.
Interestingly, Canada’s land is still changing today. The weight of the ancient 3-kilometer-thick ice was so heavy that it actually pressed the Earth’s crust down. Now that the ice is gone, the land is slowly rising back up. This process is called isostatic rebound, and it continues to shift drainage patterns and change the shapes of lakes even today.
Combined with a cool climate that prevents water from evaporating quickly, these natural forces created the unique, lake-filled landscape we see today.
