A grid of streets" on the seabed at one of the proposed locations of the lost city of Atlantis has been spotted on Google Ocean. Google Ocean, an extension of Google Earth, allows web users to virtually explore the ocean with thousands of images of underwater landscapes. The network of criss-cross lines is 620 miles off the coast of north west Africa near the Canary Islands on the floor of the Atlantic Ocean. The perfect rectangle - which is around the size of Wales - was noticed on the search giant's underwater exploration tool by an aeronautical engineer who claims it looks like an "aerial map" of a city. The underwater image can be found at the co-ordinates 31 15'15.53N 24 15'30.53W. Atlantis experts said that the unexplained grid is located at one of the possible sites of the legendary island, which was described by the ancient Greek philosopher Plato. According to his account, the city sank beneath the ocean after its residents made a failed effort to conquer Athens around 9000 BC. Dr Charles Orser, curator of historical archaeology at New York State University told The Sun that the find was fascinating and warranted further inspection. The legend of Atlantis has excited the public imagination for centuries. In recent years "evidence" of the lost kingdom has been found off the coast of Cyprus and in southern Spain.