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Lakes

Major lakes, their volumes and their condition.

6 records
Aral Sea

Once the fourth largest lake in the world, now largely gone. The Aral Sea is the most complete environmental collapse ever caused by water diversion, and the standing warning against irrig…

Lake Baikal

The deepest and oldest lake in the world, holding roughly a fifth of all unfrozen surface fresh water on Earth — more than all the North American Great Lakes combined.

Lake Superior

The largest freshwater lake in the world by surface area, and the largest of the North American Great Lakes, which together hold about a fifth of the world’s surface fresh water.

Lake Victoria

The largest tropical lake in the world and the source of the White Nile, shared by Uganda, Kenya and Tanzania.

Caspian Sea

The largest enclosed inland body of water on Earth. Saline and endorheic, it is technically a lake, and its legal classification as sea or lake has real consequences for resource rights am…

Lough Neagh

The largest lake in the British Isles by area and the source of around 40% of Northern Ireland’s drinking water. Severe cyanobacterial blooms since 2023 have made it the most prominent UK …

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Hydrionis is an evidence-led water intelligence resource. Every figure carries its source, its method and its licence. Where Hydrionis does not hold a value, it says so rather than estimating one.

Hydrionis presents scientific and regulatory information for general reference. It is not medical, legal or engineering advice. Drinking water standards are jurisdictional: a limit applies only where it was made. For a concern about the water at your own property, contact your water supplier or the relevant regulator.

Data is drawn from public and open sources under their respective licences. Contains public sector information licensed under the Open Government Licence v3.0. Contains modified Copernicus service information. Country outlines derived from Natural Earth (public domain).

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