 The "corners" in Australia, such as Cameron Corner, Haddon Corner, Poeppel Corner, and Surveyor Generals Corner, are where multiple borders meet or a border changes direction.The basic unit of the ancient Hawaiian land division system was the "ahupua'a", a self-sustaining agricultural district.The places where a road crossed the border of an "ahupua'a" were marked with distinctive altars, known as "ahu" or (stone) piles.