Landbridges, in the distant past are believed to have played a critical part in early human migration. Similarly, landbridges,both real and speculative are important components in many Atlantis theories. There is no doubt that the ending of the last Ice Age and the consequent rising sea levels led to the creation of islands where continuous land has previously existed. The separation of Ireland and Britain from each other and from mainland Europe is just one example, the latter leading to a number of writers to identify ‘Doggerland‘, which lay between Britain and Denmark as the home of Atlantis.
The two most discussed landbridges were at the Bering Strait, where it is thought that it provided the gateway for humans to enter the Americas from Asia and an Atlantic landbridge, which was very popular at the end of the 19th and beginning of the 20th centuries, but now completely abandoned. Although there was only one suggestion that the Bering Strait was in any way connected with Plato’s Atlantis, an Atlantic landbridge was seized upon by many leading scientists of the day as an explanation for the similarity of flora and fauna on both sides of the Atlantic, which was reinforced by the discovery of the Mid-Atlantic Ridge around the same time.
A number of landbridges have been proposed for the Mediterranean and linked to a variety of Atlantis theories, the most notable being proposed for the straits of Gibraltar, Sicily and Messina. Less popular theories have been constructed involving landbridges in locations, such as the Caribbean and Indonesia.