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Euboea Montes 29er

Euboea Montes is one of the tallest mountains on Io, towering roughly 10.5 km above the surrounding plains. It is a single block of crust thrust upward and tilted about 6 degrees by tectonic forces, not a volcano. A massive landslide along its northern flank produced one of the largest debris aprons in the solar system.
  Photos of Euboea Montes.

Voyager 1 view of Euboea Montes and its landslide debris apron (NASA/JPL/USGS (Voyager 1))
Euboea Montes
Quick facts
  • Stands ~10.5 km tall — taller than Everest above sea level
  • Formed by thrust faulting; tilted about 6 degrees
  • Northern-flank landslide left a ~25,000 km³ debris apron
  • Roughly 175×240 km at its base
  • Imaged by NASA's Voyager 1 in 1979