reply to post by MischeviousElf
The Azores came to my mind, vulcanic and middle in the atlantic, so I took a look at wikipedia and there you have even some more:
Islands on the Mid-Atlantic Ridge
The islands, from north to south, with their respective highest peaks and location, are:
Northern Hemisphere (North Atlantic Ridge):
1. Jan Mayen (Beerenberg, 2277 m (at 71° 06' N, 08° 12' W), in the Arctic Ocean
2. Iceland (Hvannadalshnúkur in the Vatnajökull, 2109.6 m (at 64° 01' N, 16° 41' W), through which the ridge runs
3. Azores (Ponta do Pico or Pico Alto, on Pico Island, 2351 m, (at 38°28′0″N 28°24′0″W / 38.466667°N 28.4°W / 38.466667;
-28.4
4. Bermuda (Town Hill, on Main Island, 76 m (at 32° 18′ N, 64° 47′ W) (Bermuda was formed on the ridge, but is now considerably west of
it)
5. Saint Peter and Paul Rocks (Southwest Rock, 22.5 m, at 00°55′08″N 29°20′35″W / 0.91889°N 29.34306°W / 0.91889; -29.34306
Southern Hemisphere (South Atlantic Ridge):
1. Ascension Island (The Peak, Green Mountain, 859 m, at 7° 59' S, 14° 25' W)
2. Tristan da Cunha (Queen Mary's Peak, 2062 m, at 37° 05' S, 12° 17' W)
3. Gough Island (Edinburgh Peak, 909 m, at 40° 20' S, 10° 00' W)
4. Bouvet Island (Olavtoppen, 780 m, at 54° 24' S, 03° 21' E)