Dandong, previously known as Andong and Antung, is a prefecture-level city in southeastern-eastern Liaoning province, and is the largest Chinese border city, facing Sinuiju, North Korea across the Yalu River, which demarcates the Sino-Korean border. To the southwest of the city, the river flows into Korea Bay. Dandong has therefore had a dynamic history because of its strategic location for the northeast's rich natural resources and because of its convenient access to the ocean. It is designated as a major export production centre for the province, and is a port city connected by rail with Shenyang and Sinuiju. Much trade with North Korea flows through the city.The size of the administrative city is 14,981.4 square kilometres; as of 2005, the urban area is 563 square kilometres in size and has 780,414 inhabitants. The administrative city covers around 2.4 million inhabitants as of 2009. The Hushan Great Wall, the far eastern end of the Great Wall of China, is located here.