Mauna Kea, Rising From the Sea Floor

Hawaiian islands from the sea floor. 

Mount Everest is regularly called the tallest mountain on Earth, and by one measure that is true. Everest stands 8,850 m (29,035 feet) above sea level, and no other mountain reaches higher. But Everest sits on the Tibetan plateau, 5000 m above sea level, and rises only about 3800 m (13,000 feet) above the surrounding terrain. Big, but if the bulk of the mountain was set next to Denali or Kilimanjaro it would be dwarfed. 

But another mountain you may already know is the point of this post. Mauna Kea, on the big island of Hawaii, is 4,205 m (13,796 feet) above sea level at the peak, but it's base actually lies 6,000 m (19,680 ft) below on the sea floor, for a total peak-to-base height of 10,203 m (33,476 ft), the most on Earth, land or sea. Also, check out the observatories on Mauna Kea.  I will leave you with this:

Yes, this is Hawaii. (NASA)