Geographical comparisons become more useful when the measurement is clearly defined.
For volcanoes, useful variables include:
Height
Volume
Footprint
Elevation
Volcanic type
Activity status
Location
A comparison between Mauna Loa, Mauna Kea, Tamu Massif and Ojos del Salado shows why these variables matter.
A volcano that ranks first by elevation may not rank first by volume or footprint.
https://thecampusreview.com/geography/biggest-volcano-in-the-world/

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