Gyeongju (경주, ), historically known as Seorabeol (서라벌, ), is a coastal city in the far southeastern corner of North Gyeongsang Province in South Korea. It is the second largest city by area in the province after Andong, covering with a population of 264,091 people (as of December 2012.) Gyeongju is southeast of Seoul, and east of Daegu. The city borders Cheongdo and Yeongcheon to the west, Ulsan to the south and Pohang to the north, while to the east lies the coast of the Sea of Japan. Gyeongju was the capital of the ancient kingdom of Silla (57 BC – 935 AD), which ruled about two-thirds of the Korean Peninsula at its height between the 7th and 9th centuries, for close to one thousand years. Later Silla was a prosperous and wealthy country, and its metropolitan capital of Gyeongju was the fourth largest city in the world. A vast number of archaeological sites and cultural properties from this period remain in the city. Gyeongju is often referred to as "the museum without walls". Among such historical treasures, Seokguram grotto, Bulguksa temple, Gyeongju Historic Areas and Yangdong Folk Village are designated as World Heritage Sites by UNESCO. The many major historical sites have helped Gyeongju become one of the most popular tourist destinations in South Korea. The city of Gyeongju was united with the nearby rural Gyeongju County in 1995 and is now an urban–rural complex. It is similar to 53 other small and medium-sized cities with a population under 300,000 people in South Korea. As well as its rich historical heritage, Gyeongju today is affected by the economic, demographic, and social trends that have shaped modern South Korean culture. Tourism remains the major economic driver, but manufacturing activities have developed due to its proximity to major industrial centers such as Ulsan and Pohang. Gyeongju is connected to the nationwide rail and highway networks, which facilitate industrial and tourist traffic.