Although this particular landform, officially known as the Great Meteor Seamount, has been widely studied for years by scientists studying seismology and geology, no one has ever made the connection to Saint Brendan's Isle. […] Judging by the satellite images, the submerged island is part of the Mid-Atlantic Ridge, which, although located underwater, is the world's largest mountain range. As you can see by the Google Earth pictures, Saint Brendan's Island, at one time, may have been the southernmost tip of a much larger "lost continent". Perhaps Atlantis?
When we entered the boat and set sail, clouds overshadowed us on every side, so dense that we could scarcely see the prow or the stern of the boat. After the lapse of an hour or so, a great light shone around us, and land appeared, spacious and grassy, and bearing all manner of fruits. And when the boat touched the shore; we landed, and walked round about the island for fifteen days, yet could not reach the limits thereof. No plant saw we there without its flower; no tree without its fruit; and all the stones thereon were precious gems. But on the fifteenth day we discovered a river flowing from the west towards the east, when, being at a loss what to do, though we wished to cross over the river, we awaited the direction of the Lord. While we thus considered the matter, there appeared suddenly before us a certain man, shining with a great light, who, calling us by our names, addressed us thus’: ‘Welcome, worthy brothers, for the Lord has revealed to yon the land He will grant unto His saints. There is one-half of the island up to this river, which you are not permitted to pass over; return, therefore, whence you came.’ (trans. Denis O’Donoghue)
Isidore’s paradise is a very specific one, drawn from Greco-Roman precedents:
The Fortunate Islands signify by their name that they produce all manner of good things, as if they were happy and blessed with an abundance of fruit. For suited by their nature they produce fruit from precious trees; grape vines of their own accord clothe the hillsides; instead of grass, crops (i.e., wheat) and vegetables are common. Hence, the error of the Gentiles and of the songs of the poets, which suppose this place to be the same as Paradise because of the fertility of the soil. (14.6.8, my trans.)
None of this has anything to do with a ridge in the Atlantic Ocean which no one knew existed until the 1920s.