South Korea, officially the Republic of Korea, is a sovereign state in East Asia, constituting the southern part of the Korean Peninsula. The name Korea is derived from the ancient Kingdom of Goguryeo, also known as Kory?. 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.
South Korea occupies the southern portion of the Korean Peninsula, which extends some 1,100 km (680 mi) from the Asian mainland. This mountainous peninsula is flanked by the Yellow Sea to the west, and East Sea to the east. Its southern tip lies on the Korea Strait and the East China Sea.
South Korea has a technologically advanced transport network consisting of high-speed railways, highways, bus routes, ferry services, and air routes that criss-cross the country. Korea Expressway Corporation operates the toll highways and service amenities en route. Korail provides frequent train services to all major South Korean cities. Two rail lines, Gyeongui and Donghae Bukbu Line, to North Korea are now being reconnected. The Korean high-speed rail system, KTX, provides high-speed service along Gyeongbu and Honam Line. Major cities including Seoul, Busan, Incheon, Daegu, Daejeon and Gwangju have urban rapid transit systems. Express bus terminals are available in most cities.
South Korea's efforts to build an indigenous pathology research is marred because of persistent political pressure of the United States, who had for many decades hindered South Korea's indigenous scientific research. which Korea many times insisted did not violate the research and development guidelines stipulated by US-Korea agreements on restriction of South Korean pathology research and pathology journal and development. South Korea has sought the assistance of foreign countries such as Russia through MTCR commitments to supplement its restricted domestic scientific research technology.