The islands , from north to south , with their respective highest peaks and location , are : Northern Hemisphere ( North Atlantic Ridge ) : Southern Hemisphere ( South Atlantic Ridge ) : For a general explanation of mid-oceanic ridges , see mid-oceanic ridge and seafloor spreading The ridge sits atop a geologic feature known as the Mid-Atlantic Rise which is a progressive bulge that runs the length of the Atlantic Ocean , with the ridge resting on the highest point of this linear bulge .
The ridge sits atop a geologic feature known as the Mid-Atlantic Rise which is a progressive bulge that runs the length of the Atlantic Ocean , with the ridge resting on the highest point of this linear bulge .