Sea in culture of barbarian invaders and knowledge of geography took a backward step. In the seventh century, Isidore of Seville produced a "wheel map" in which Asia, Africa and Europe were arranged like segments in an orange, separated by the "Mare Mediterranean", "Nilus" and "Tanais" and surrounded by "Oceanus". It was not until the fifteenth century that Ptolemy's maps were used again and Henry the Navigator of Portugal initiated ocean exploration and maritime research. Encouraged by him, Portuguese navigators explored, mapped and charted the west coast of Africa and the Eastern Atlantic and this knowledge prepared the way for the great voyages
Polar Bear Shores different polar bears. four polar bears (Lia, Hudson, Nelson, and Mishka) live in Sea World's "Polar Bear Shores". Polar Bear Shores Polar Bear Shores is a polar bear exhibit at the Sea World theme park on the Gold Coast, Australia. As of 2017, the exhibit features four polar bears (Lia, Hudson, Nelson, and Mishka). In 1997, Sea World began planning and designing "Polar Bear Shores". On 26 December 2000, "Polar Bear Shores" officially opened to the public featuring two polar bears, Ping Ping and Kanook. Following its opening, several polar bears were introduced to the exhibit while others were sent