In addition to creating the massive wall, the Ming Dynasty also enclosed their most important agricultural center, Liaoning Province, behind a walled fortification known as the Liaoning Wall (also known as the Liaodong Wall). This wall has been a source of controversy between China and North Korea since 2009 CE when the Chinese government claimed they had only recently discovered portions of the Great Wall close to the border with North Korea by the Hushan Mountains. North Korea has asserted that the 'newly discovered Great Wall' actually belongs to them and is not part of China's Great Wall. The section of wall in dispute is no doubt part of the Liaoning Wall. This wall in no way can be compared with the Great Wall and was never built to be. It was a simple defensive barrier constructed to hamper invasions of Liaoning from the north and was constructed of earth, stone, and whatever else was available. Moats were dug on either side of the wall to further impede an invading force.