Ko te Mid-Atlantic Ridge (MAR) he pae maunga i waenganui o te moana, he paepae tectonic rerekee, he rohe paepae hanga ranei kei te papa o te Moana-a-Kiwa o te Moana-a-Kiwa, me tetahi waahanga o te maunga roa rawa atu o te ao. I te Raki o te Moana-a-Kiwa, ka wehe i nga papa Eurasian me Amerika ki te Raki, i te Moana-a-Kiwa, ka wehe i nga papa o Awherika me Amerika ki te Tonga. Ko te paepae kei te whakawhānui mai i te hononga ki te Gakkel Ridge (Mid-Arctic Ridge) ki te raki-rawhiti o Greenland ki te tonga ki te Bouvet Triple Junction i te Moana-a-Kiwa. Ahakoa ko te Mid-Atlantic Ridge he ahuatanga kei raro i te wai, he nui nga waahanga o te teitei ki runga ake i te taumata o te moana. Ko te waahanga o te paepae e mohiotia ana ko Iceland e mohiotia ana ko Reykjanes Ridge.
Ko Reykjanes Ridge