Question: Oksan Station is located in which East Asian country?

full_context: Document 1: Korean diaspora: The Korean diaspora (South Korea: Hangul: 재외국민 ; RR: "Jaeoe gugmin "; lit. Overseas national or Hangul: 한국계 교민 ; Hanja: 韓國系 僑民 ; RR: "Hanguggye gyomin "; lit. Korean immigrants ; North Korea: Hangul: 해외국민 ; RR: "Haeoe gugmin "; lit. Overseas nation or Hangul: 한국계 동포 ; Hanja: 韓國系 同胞 ; RR: "Hanguggye dongpo "; lit. Korean compatriots ) consists of roughly seven million people, both descendants of early emigrants from the Korean Peninsula, as well as more recent emigres from Korea. Nearly four-fifths of expatriate Koreans live in just three countries: China, the United States, and Japan. Other countries with greater than 0.5% Korean minorities include Canada, Russia, Uzbekistan, Kazakhstan, Australia, Vietnam, and Philippines. All these figures include both permanent migrants and sojourners.
Document 2: Xinzuoying Station: Xinzuoying Station (TRA, ) or Zuoying Station (THSR and KMRT), is a major railway station served by Taiwan Railway Administration, Taiwan High Speed Rail, and Kaohsiung Mass Rapid Transit located in Zuoying District, Kaohsiung, Taiwan. Passengers can transfer between TRA Western Line, KMRT Red Line, and THSR at this station, and it is the only rail station in southern Taiwan where three rail systems converge. The station handles over 64,000 passengers daily on conventional rail, metro, and high-speed rail.
Document 3: Ryongsong Line: The Ryongsŏng Line is an electrified standard-gauge secondary line of the Korean State Railway in P'yŏngyang, North Korea, running from Sŏp'o on the P'yŏngŭi Line to Tongbungri on the P'yŏngra Line. From Ryongsŏng, this line also has a line connecting to the private railway station attached to Residence No. 55, the primary residence of Kim Jong-un. The maintenance facilities for the North Korean leaders' trains are also located at Ryongsŏng Station.
Document 4: Economy of South Korea: The economy of South Korea is the fourth largest economy in Asia and the 11th largest in the world. It is a mixed economy dominated by family-owned conglomerates called chaebols, however, the dominance of chaebol is unlikely and at risk to support the transformation of Korean economy for the future generations. South Korea is famous for its spectacular rise from one of the poorest countries in the world to a developed, high-income country in just one generation. This economic miracle, commonly known as the Miracle on the Han River, brought South Korea to the ranks of elite countries in the OECD and the G-20. South Korea still remains one of the fastest growing developed countries in the world following the Great Recession. It is included in the group of Next Eleven countries that will dominate the global economy in the middle of the 21st century.
Document 5: List of companies of South Korea: South Korea is a sovereign state in East Asia, constituting the southern part of the Korean Peninsula. Highly urbanized at 92%, South Koreans lead a distinctive urban lifestyle; half of them live in high-rises concentrated in the Seoul Capital Area with 25 million residents and the world's sixth leading global city with the fourth largest economy and seventh most sustainable city in the world.
Document 6: Bundang-gu: Bundang-gu is the largest and most populous district ("gu") of Seongnam, a major city in the Seoul Capital Area, South Korea. Bundang is one of South Korea's wealthiest and highest developed areas, being the nation's first and largest completely artificial city built in the early 1990s. Many high-rise luxury condos moved in the early 2000s, with a second planned city built in the late 2000s called Pangyo in the same district. Apartment prices are the second highest in Gyeonggi-do after Gwacheon and 10th highest nationwide, higher than many central Seoul districts such as Mapo-gu or Jongno-gu. Apartments around Pangyo Station and the high-rise luxury condos around Jeongja Station and Sunae Station rival prices in the most expensive areas in the country. Unlike older cities such as Seoul, Bundang has no telephone poles overground, resulting in a clean cityscape with well-designed streets.
Document 7: Seoul: Seoul ( ; 서울; ] ), officially the Seoul Special Metropolitan City – is the capital and largest metropolis of the Republic of Korea (commonly known as South Korea). Seoul is the world's 16th largest city, and forms the heart of the Seoul Capital Area, which includes the surrounding Incheon metropolis and Gyeonggi province. The Seoul Capital Area houses about half of the country's population of 51.44 million people with 678,102 international residents.
Document 8: Dora Observatory: Dora Observatory is on the South Korean side of the 38th parallel. Situated on top of Dorasan (Mount Dora), the observatory looks across the Demilitarized Zone. It is the part of South Korea closest to the North. Visitors can catch a rare glimpse of the reclusive North Korean state through binoculars from the 304 square feet, 500-person capacity observatory. They will be able to see the North Korean propaganda village situated in the DMZ, a remnant of the old prosperity of the North, and can see as far as the city of Kaesong. The observatory is very close to the Third Tunnel (Third North Korean Infiltration Tunnel), a massive North Korean-dug tunnel which was planned as a pathway for invasion to the South if war had re-erupted and it had not been discovered. The Dorasan Station, also nearby, is designed to be the station that connects the railroads of the South and North one day in the future.
Document 9: Oksa: Oksa is a village in Jędrzejów County, Świętokrzyskie Voivodeship, in south-central Poland. It is the seat of the gmina (administrative district) called Gmina Oksa. It lies approximately 18 km north-west of Jędrzejów and 41 km south-west of the regional capital Kielce. The village has an approximate population of 890.
Document 10: Oksan Station: Oksan Station is a station on the Gyeongbuk Line in South Korea.
Document 11: Geography of South Korea: South Korea is located in East Asia, on the southern half of the Korean Peninsula jutting out from the far east of the Asian land mass. The only country with a land border to South Korea is North Korea, lying to the north with 238 km of border running along the Korean Demilitarized Zone. South Korea is mostly surrounded by water and has 2,413 km of coast line along three seas. To the west is the Yellow Sea, to the south is the East China Sea, and to the east is Ulleung-do and Liancourt Rocks in the (East Sea). Geographically, South Korea's land mass is approximately 100,032 km2 . 290 km2 of South Korea are occupied by water. The approximate coordinates are 37° North, 127° 30 East.
Document 12: Osan Air Base: Osan Air Base (K-55; Korean: 오산공군기지 ; Hanja: 烏山空軍基地 ), is a United States Air Force base located near Songtan Station in the city of Pyeongtaek, South Korea, 64 km south of Seoul. Despite its name, Osan AB is not within Osan City, which is 7.5 km to the north. The base is the home of the Pacific Air Forces' 51st Fighter Wing, and a number of tenant units, including the headquarters for Seventh Air Force. The base is also the headquarters of the ROK Air Force Operations Command. Osan Air Base is also the departure and arrival point for U.S. government-contracted "Patriot Express" flights bringing service members and their family members to South Korea from Seattle-Tacoma International Airport in the U.S. state of Washington, Misawa Air Base and Yokota Air Base in Japan.
Document 13: South Korea: South Korea, officially the Republic of Korea (abbreviated ROK), is a sovereign state in East Asia, constituting the southern part of the Korean Peninsula. Officially, its territory consists of the whole Korean Peninsula and its adjacent islands, which are largely mountainous. South Koreans lead a distinctive urban lifestyle, as half of them live in high-rises concentrated in the Seoul Capital Area with 25 million residents. The capital Seoul is the world's sixth leading global city with the fifth largest economy and is the seventh most sustainable city in the world.
Document 14: Overseas Chinese Town Station: OCT Station (), also referred to as Overseas Chinese Town Station in English, and formerly known as Huaqiaocheng Station, is a station on Line 1 of the Shenzhen Metro. It opened on December 28, 2004. It is located underground at Shennan Dadao (), near Shenzhen Bay Hotel (), in Nanshan District, Shenzhen, China. The station is named after Overseas Chinese Town (OCT) (). It is also located close to Splendid China () and China Folk Culture Village ().
Document 15: List of tallest buildings in South Korea: This list of tallest buildings in South Korea ranks skyscrapers in South Korea by height. The tallest building in South Korea is currently the 123–story Lotte World Tower, which rises 555 m and was completed in 22nd December 2016. It is also the world's 5th tallest building. There are currently three buildings over 300m under construction in South Korea. The three-building complex Haeundae LCT The Sharp in also under construction in Busan, and will reach 412 m . There are various other projects planned over 300 meters, including the 338 m tall Parc1, scheduled to resume construction in 2016, the 510 m tall Busan Lotte Tower currently on hold, as well as the 553 m tall Hyundai Global Business Center slated for completion in 2021.
ground_truth: South Korea