Five hundred years ago a European could search in vain the map of "the world" for America, or Australia, or the Pacific Ocean. Experienced mariners, and even learned geographers, were quite unaware that beyond the Western Sea lay two great continents peopled by red men; of Africa they knew only the northern coast; and in respect of Asia a thousand absurd tales passed current. The unexplored waste of waters that constituted the Atlantic Ocean was, to many ignorant Europeans of the fifteenth century, a terrible region frequented by fierce and fantastic monsters. To the average European the countries surveyed in the preceding chapter, together with their Muslim neighbors across the Mediterranean, still comprised the entire known world.