Lake Baikal bottoms out at 1,642 meters — here are the ten deepest lakes on Earth, ranked by maximum depth.
Quick answer: 1. Lake Baikal, 2. Lake Tanganyika, 3. O'Higgins–San Martín, 4. Lake Malawi, 5. Issyk-Kul, 6. Great Slave Lake, 7. Crater Lake, 8. Lake Matano, 9. General Carrera, 10. Hornindalsvatnet.
How deep can a lake go? Far deeper than most people imagine — the deepest ones are ancient rift valleys and collapsed volcanoes whose floors sit hundreds of meters below sea level, holding some of the planet's largest reserves of fresh water. This list ranks the ten deepest lakes on Earth by maximum depth, the single deepest point below the surface. It's for geography nerds, trivia night, and anyone planning a trip to stand on the edge of something absurdly deep.
The deepest lake on the planet, and not by a little — Baikal out-depths its nearest rival by about 170 meters. It sits in an ancient continental rift that is still slowly pulling apart, which is why it is so old, so deep, and so full of species found nowhere else.
The world's longest freshwater lake and the second deepest, Tanganyika formed in the same kind of ancient rift valley as Baikal. Its depths hold around 18% of the world's fresh water and hundreds of endemic fish species.
The deepest lake in the Americas, straddling the Chile–Argentina border in Patagonia. Its milky light-blue color comes from rock flour ground by glaciers of the Southern Patagonian Ice Field. A 2004 survey put its maximum depth at 836 m; newer surveys revised it to 799 m — still a comfortable third.
The second deepest lake in Africa, and arguably the most biodiverse lake on Earth — it holds more fish species than any other lake in the world, with over a thousand species, most of them cichlids found nowhere else.
Its name means 'warm lake' in Kyrgyz, and it lives up to it — Issyk-Kul never freezes despite snow-capped Tian Shan peaks all around, thanks to slight salinity and geothermal activity. It is one of the largest alpine lakes on Earth.
The deepest lake in North America, in Canada's Northwest Territories. It freezes from November to mid-June, and the ice sheet gets thick enough to support winter roads — locals literally drive trucks across it.
The deepest lake in the United States, filling the caldera left when Mount Mazama erupted and collapsed about 7,700 years ago. With no inflowing streams, the water is famously pure — and famously blue.
The deepest lake in Indonesia — and the deepest lake on any island in the world. This ancient tectonic lake formed 1–2 million years ago in a graben rift, and its isolated depths host unique endemic species.
A glacial lake cradled by the Andes on the Chile–Argentina border, famous for the Marble Caves — swirling blue caverns carved into the shoreline rock by millennia of wave erosion.
The deepest lake in Europe, a long, narrow glacial trough in western Norway. Its waters have been fished and farmed around for centuries, and the lake still supplies a fish hatchery and local hydropower.
| # | Name | countries | knownFor |
|---|---|---|---|
| 1 | Lake Baikal | Russia | Holds ~20% of Earth's unfrozen surface fresh water; oldest lake in the world (25–30 million years); UNESCO World Heritage Site since 1996 |
| 2 | Lake Tanganyika | Tanzania, DR Congo, Burundi, Zambia | World's longest freshwater lake; formed in an ancient rift valley like Baikal |
| 3 | O'Higgins–San Martín | Chile, Argentina | Deepest lake in the Americas; glacial lake fed by the Southern Patagonian Ice Field |
| 4 | Lake Malawi | Malawi, Mozambique, Tanzania | More fish species than any other lake in the world; known as Lake Nyasa in Tanzania |
| 5 | Issyk-Kul | Kyrgyzstan | Never freezes ('warm lake' in Kyrgyz); among the largest alpine lakes in the world |
| 6 | Great Slave Lake | Canada | Deepest lake in North America; frozen thick enough for ice roads in winter |
| 7 | Crater Lake | United States | Deepest lake in the US; fills the caldera of Mount Mazama, which collapsed ~7,700 years ago |
| 8 | Lake Matano | Indonesia | Deepest lake on any island in the world; ancient tectonic lake (~1–2 million years old) |
| 9 | General Carrera | Chile, Argentina | Famous for the Marble Caves carved into its shoreline; glacially fed by the Andes |
| 10 | Hornindalsvatnet | Norway | Deepest lake in Europe |
Items are ranked by maximum depth in meters — the single deepest measured point in each lake, per published bathymetric surveys. We included naturally occurring surface lakes (fresh or saline) with a widely published maximum-depth figure. We excluded the Caspian Sea (1,025 m) because it is classed as a sea in most geographic references, and Lake Vostok (~900 m) because it lies sealed under ~2.5 miles of Antarctic ice and its depth is a remote-sensing estimate rather than a direct sounding. O'Higgins/San Martín: a 2004 survey recorded 836 m near O'Higgins Glacier, but the most recent published figure is 799 m; we used 799 m. It ranks third under either figure.
Lake Baikal in Siberia, Russia, at 1,642 meters (5,387 ft) — roughly 170 meters deeper than its nearest rival, Lake Tanganyika. It's also the world's oldest lake (25–30 million years) and holds around a fifth of Earth's unfrozen surface fresh water.
The Caspian Sea (1,025 m) is classed as a sea in most geographic references, not a lake, so we excluded it. Lake Vostok (~900 m) is sealed under about 2.5 miles of Antarctic ice and its depth is a remote-sensing estimate rather than a direct sounding. Neither would displace the top two.
Maximum depth is the single deepest point in the lake, measured by sonar soundings and bathymetric surveys. Figures get revised as surveys improve — O'Higgins/San Martín was listed at 836 m in a 2004 survey and later revised to 799 m, without changing its rank.
Asia holds the deepest (Lake Baikal, Russia), Africa the second (Lake Tanganyika). The deepest in the Americas is O'Higgins/San Martín on the Chile–Argentina border; Great Slave Lake (Canada) is the deepest in North America and Crater Lake (Oregon) the deepest in the United States. Europe's deepest is Hornindalsvatnet in Norway.
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