Wiktionary
mid-oceanic ridge
n. (context geology English) any of an interconnected system of broad submarine rises formed by plate tectonics
Usage examples of "mid-oceanic ridge".
The list of options looked endless: tide pool, marsh, lagoon, reef, mid-oceanic ridge, sulfur vents.
Not too far off the coast (geographically speaking) is what should (if the gods did not play with loaded dice) be a mid-oceanic ridge.