Gyeonggi Province (Korean: 경기도 / 京畿道 Gyeonggido) is an administrative province of South Korea and the most populous local administrative division in the country, with its capital being Suwon. Surrounding the national capital of Seoul and Incheon Metropolitan City, Gyeonggi Province covers a total area of 10,175 square kilometres and has a population of over 13 million. It is bordered to the north by the Korean Demilitarised Zone (the 38th parallel) with the Democratic People's Republic of Korea, to the east by Gangwon Special Self-Governing Province, to the south by North Chungcheong Province and South Chungcheong Province, and to the west by the People's Republic of China across the sea. As part of the Seoul Capital Area, Gyeonggi Province is densely populated and well connected by transportation, having long become South Korea's largest industrial zone. The fertile Han River plain has been renowned since ancient times for its production of Gyeonggi rice. Historically, Gyeonggi Province has long been part of the capital region, leaving behind numerous historical sites. Hwaseong Fortress in Suwon, Namhansanseong Fortress, and the Royal Tombs of the Joseon Dynasty are UNESCO World Heritage Sites.