A land bridge, in biogeography,'s an isthmus or wider land connection between otherwise separate areas, which allows terrestrial animals and plants to cross over and colonise new lands. Land bridges can be created by marine regression, in which sea levels fall, exposing shallow, previously submerged sections of continental shelf; or when new land's created by plate tectonics; or occasionally when the sea floor rises due to post-glacial rebound after an ice age. Prominent Examples The Bering la… (More on Landbridge)