Where is the highest mountain?
The highest known mountain is Mount Olympus on Mars. It is 22
kilometers high. (That's a bit over 72,000 feet.)
The highest mountain above sea level on Earth is Mount Everest
(on the border of Nepal and Tibet) at 29,029 feet; but the tallest
mountain on Earth is Mauna Kea in Hawaii. From where it starts
under the ocean to its very peak it is 33,465 feet tall.