There was a time when geographical knowledge meant little more than that heaven is round, and the earth square, formed from the body of the legendary giant Pan Ku, or that the sky is held up by tortoise feet while the land rests on a turtle's back.
人們早前對地理一無所知，直覺地認為，天是圓的、地是方的，甚至流傳著「盤古開天」、「四隻鱉足撐著天、海龜著地」… … 一類的神奇傳說。