Where does this come from, and can I check it?

Hidden four kilometres under the East Antarctic Ice Sheet, Lake Vostok has been sealed for millions of years. The figure is taken from National Geographic, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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Yes. It sits on the World Geography shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

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Lake Vostok is a massive freshwater lake buried beneath Antarctic ice

Hidden four kilometres under the East Antarctic Ice Sheet, Lake Vostok has been sealed for millions of years.

Lake Vostok is the largest of over 400 known subglacial lakes in Antarctica, spanning 250 kilometres in length. Geothermal heat from Earth's interior keeps the lake water liquid beneath the freezing ice sheet pressure. Scientists study its isolated environment as an analogue for conditions on icy moons like Europa.

FMIB 39495 Iceberg in the Antarctic Ocean — George Frederick Wright · Public domain · source

Where this comes from

National Geographic

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Lake Vostok is the largest subglacial lake in AntarcticaA massive freshwater body lies sealed beneath four kilometres of Antarctic ice Lake Natron in Tanzania has extremely alkaline waterVolcanic sodium carbonate deposits give Lake Natron a pH level as high as 10.5.Crater Lake is the deepest lake in the United StatesFormed in a collapsed volcanic caldera in Oregon, Crater Lake reaches a measured depth of 594 metres.Lake Huron features the longest shoreline of any freshwater lakeIncluding its 30,000 islands, Lake Huron coastline extends for 6,157 kilometres.Lake Victoria is the largest tropical lake in the worldCovering nearly 60,000 square kilometres, Lake Victoria is shared by Tanzania, Uganda, and Kenya.Lake Baikal holds one fifth of Earth unfrozen fresh waterLocated in Siberia, Lake Baikal contains more water than all the North American Great Lakes combined.

Tags: lake vostok, antarctica, subglacial, lakes

Lake Vostok is a massive freshwater lake buried beneath Antarctic ice: the short answers

Where does this come from, and can I check it?: Hidden four kilometres under the East Antarctic Ice Sheet, Lake Vostok has been sealed for millions of years. The figure is taken from National Geographic, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a world geography fact?: Yes. It sits on the World Geography shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.