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Top 5 tallest mountains in the Solar System

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The 5 tallest mountains in the Solar System by peak height above surrounding terrain: Olympus Mons (Mars), Equatorial Ridge (Iapetus), and more.

Snapshot · 2026-09-01

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  1. 1

    Olympus Mons (Mars)

    21.9-26 km

  2. 2

    Equatorial Ridge (Iapetus)

    ~20 km

  3. 3

    Boosaule Montes 'South' (Io)

    17.5-18.2 km

  4. 4

    Ascraeus Mons (Mars)

    14.9 km

  5. 5

    Ionian Mons east ridge (Io)

    12.7 km