🇪🇸 Spain · Phantom island
Saint Brendan's Isle (San Borondón)
Voyage c.530 (hagiography 8th c.); mapped 9th c.–1850 · Irish monastic immram + medieval mappa mundi
Brendan's 6th c. currach Promised Land at 28N 23W – Severin 1976 proved voyage feasible but not island.