If we were to measure by peak height above sea level then starting with Mount Everest all 25 of the tall mountains in the world would be in the Himalayas. The problem with doing that, however, is that the dividing line between a mountain with multiple peaks and separate mountains is not always clear. For this reason a better measurement to use is called “topographic prominence” (basically how much the mountain sticks out from the surrounding landscape). So, while Mount Kilimanjaro’s peak is not as far away from sea level as any number of peaks in the Himalayas, the difference between its base and its peak is much greater. With that in mind these are the 25 highest mountains in the world.