It has been thought that when Plato wrote of the
Sea of Atlantis, he may have been speaking of the area now called the Atlantic Ocean. The ocean's name, derived from Greek mythology, means the "Sea of
Atlas". Plato remarked that, in describing the origins of Atlantis, this area was allotted to Poseidon. In Ancient Greek times the terms "Ocean" and "Atlas" both referred to the 'Giant Water' which surrounded the main landmass known at that time by the Greeks, which could be described as
Eurafrasia (although this whole supercontinent was far from completely known to the Ancient Greeks), and thus this water mass was considered to be the 'end of the (known) world', for the same reason the name "Atlas" was given to the mountains near the Ocean, the
Atlas Mountains, as they also denoted the 'end of the (known) world'.
Azores Islands One of the suggested places for Atlantis is around the
Azores Islands, a group of islands belonging to Portugal located about west of the Portuguese coast. Some people believe the islands could be the mountain tops of Atlantis.
Ignatius L. Donnelly, an American
congressman, was perhaps the first one to talk about this possible location in his book
Atlantis: The Antediluvian World (1882). Ignatius L. Donnelly also makes a connection to the mythical
Aztlán.
Charles Schuchert, in a paper called "Atlantis and the permanency of the North Atlantic Ocean bottom" (1917), discussed a lecture by
Pierre-Marie Termier in which Termier suggested "that the entire region north of the Azores and perhaps the very region of the Azores, of which they may be only the visible ruins, was very recently submerged", reporting evidence that an area of 40,000 sq. mi and possibly as large as 200,000 sq. mi. had sunk 10,000 feet below the surface of the Atlantic Ocean. Schuchert's conclusion was: : (1) "that the Azores are volcanic islands and are not the remnants of a more or less large continental mass, for they are not composed of rocks seen on the continents"; : (2) "that the tachylytes dredged up from the Atlantic to the north of the Azores were in all probability formed where they are now, at the bottom of the ocean"; and : (3) "that there are no known geologic data that prove or even help to prove the existence of Plato's Atlantis in historic times." The Azores are steep-sided volcanic seamounts that drop rapidly 1000 meters (about 3300 feet) to a plateau. Cores taken from the plateau and other evidence shows that this area has been an undersea plateau for millions of years. Ancient indicators, i.e.
relict beaches, marine deposits, and
wave cut-terraces, of
Pleistocene shorelines and sea level show that the Azores Islands have not subsided to any significant degree. Instead, they demonstrate that some of these islands have actually risen during the Late and Middle Pleistocene. This is evidenced by relict, Pleistocene wave-cut platforms and beach sediments that now lie well above current sea level. For example, they have been found on
Flores Island at elevations of 15–20, 35–45, ~100, and ~250 meters above current sea level. Three tectonic plates intersect among the Azores, the so-called
Azores triple junction.
Canary Islands, Madeira and Cape Verde The Canary Islands have been identified as remnants of Atlantis by numerous authors. For example, in 1803,
Bory de Saint-Vincent in his ''Essai sur les îles fortunées et l'antique Atlantide
proposed that the Canary Islands, along with the Madeira, and Azores, are what remained after Atlantis broke up. Many later authors, i.e. Lewis Spence in his The Problem of Atlantis'', also identified the Canary Islands as part of Atlantis left over from when it sank. Detailed geomorphic and geologic studies of the Canary Islands clearly demonstrate that over the last 4 million years, they have been steadily uplifted, without any significant periods of subsidence, by geologic processes such as erosional unloading, gravitational unloading, lithospheric flexure induced by adjacent islands, and volcanic underplating. For example,
Pliocene pillow lavas, which solidified underwater and now exposed on the northeast flanks of
Gran Canaria, have been uplifted between 46 and 143 meters above sea level. A series of raised, Pleistocene
marine terraces, which become progressively older with increasing elevation, on Fuerteventura indicate that it has risen in elevation at about 1.7 cm per thousand years for the past one million years. The elevation of the marine terrace for the highstand of sea level for the
last interglacial period shows that this island has experienced neither subsidence nor significant uplift for the past 125,000 years. Within the
Cape Verde Islands, the detailed mapping and dating of 16 Pleistocene marine terraces and Pliocene marine
conglomerate found that they have been uplifted throughout most of the Pleistocene and remained relatively stable without any significant subsidence since the last interglacial period. Finally, detailed studies of the sedimentary deposits surrounding the Canary Islands have demonstrated, except for a narrow rim around each island exposed during
glacial lowstands of sea level, a complete lack of any evidence for the ocean floor surrounding the Canary Islands having ever been above water.
Northern Spain According to Jorge Maria Ribero-Meneses, Atlantis was in northern Spain. He specifically argues that Atlantis is the
underwater plateau, known internationally as "Le Danois Bank" and locally as "The Cachucho". It is located about 25 kilometers from the continental shelf and about 60 km off the coast of Asturias, and Lastres between Ribadesella. Its top is now 425 meters below the sea. It is 50 kilometers from east to west and 18 km from north to south. Ribero-Meneses speculated that is part of the continental margin that broke off at least 12000 years ago as the result of tectonic processes that occurred at the end of the last ice age. He argues that they created a tsunami with waves with heights of hundreds of meters and that the few survivors had to start virtually from scratch. Detailed studies of the geology of the Le Danois Bank region have refuted the proposal by Jorge Maria Ribero-Meneses that the Le Danois Bank was created by the collapse of the northern Cantabrian continental margin about 12,000 years ago. The Le Danois Bank represents part of the continental margin that have been uplifted by thrust faulting when the continental margin overrode oceanic crust during the
Paleogene and
Neogene periods. Along the northern edge of the Le Danois Bank,
Precambrian granulite and
Mesozoic sedimentary rocks have been thrust northward over
Miocene and
Oligocene marine sediments. The basin separating the Le Danois Bank from the Cantabrian continental margin to the south is a
graben that simultaneously formed as a result of normal faulting associated with the thrust faulting. In addition, marine
sediments that range in age from lower
Pliocene to
Pleistocene, cover large parts of Le Danois Bank, and fill the basin separating it from the Cantabrian continental margin demonstrate that this bank has been submerged beneath the Bay of Biscay for millions of years. ==Atlantic Ocean: North==