# Mount Everest - how tall (from base)?

Mount Everest's tip is 8,848 meters above sea level, but how tall is it above its base? Or to put it another way, how tall is its base? And how are they defining its base?
This webpage:
https://en.wikipedia.org/wiki/Mount_Everest#Comparisons
says its base is 4,200-5,200 meters *above* sea level.
But this...
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Mount Everest's tip is 8,848 meters above sea level, but how tall is it above its base? Or to put it another way, how tall is its base? And how are they defining its base?

This webpage:

https://en.wikipedia.org/wiki/Mount_Ever...

says its base is 4,200-5,200 meters *above* sea level.

But this webpage:

https://en.wikipedia.org/wiki/Topographi...

says its dry prominence is measured against the deepest point in the ocean, which is 10,911 meters below sea level.

This webpage:

https://en.wikipedia.org/wiki/Mount_Ever...

says its base is 4,200-5,200 meters *above* sea level.

But this webpage:

https://en.wikipedia.org/wiki/Topographi...

says its dry prominence is measured against the deepest point in the ocean, which is 10,911 meters below sea level.

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