Changwon (tɕhaŋ.wʌn) is the capital and largest city of Gyeongsangnam-do, South Korea (with a population of 1,025,702 ), and the 11th largest city of the country. A port city, Changwon is bordered by Masan Bay to the south, and the cities of Busan and Gimhae to the east. The city of Miryang lies to the northeast, and Jinju to the west. The region has been inhabited since the Bronze Age, and its urban areas have been renamed and re-organized many times throughout history. In 1974, with the creation of the Changwon National Industrial Complex, the three historically interdependent cities of Masan, Jinhae, and Changwon began to undergo significant economic development, growing into an important industrial centre. On 1 July 2010, the cities of Changwon, Jinhae, and Masan merged to form the current city of Changwon. As Korea's first planned city, modeled after Canberra, Australia, Changwon uses accessible urban planning including many parks and separate residential and industrial areas. The city has also branded itself an "environmental capital" with the municipal government actively participating in climate change conferences and committing to the development of sustainable policies like the globally recognized bike-sharing program, Nubija. Populated since the early Bronze Age, the area surrounding Masan Bay would have been a wide open region between the ocean and the hilly lands of the coastal plain. Today ruins can be found in the area dating from the Iron Age. Typical Iron Age landmarks include Bangyedong monuments, dolmens, holy mounds, lower molar sites, and dolmens from Bronze Age settlements. In 209 AD, during the Three Kingdoms period, the area was named Gulja-gun, a province of the Silla kingdom. During the Unified Silla Period, this region was renamed to Uian-gun in 739 AD, during the reorganization of all Silla provinces, then in the Goryeo Period, to Uichang-hyeon. The name Changwon was first used in 1408 during the Joseon period, when King Taejong established the city as Changwon-bu.