South Korea covers an area of 100,210 sq km on the southern half of the Korean Peninsula. Seventy percent of the country is mountainous, while arable lowlands are along the west coast. South Korea only shares a land border with North Korea. The official language is Korean, spoken by 99% of the population. Major religions include Buddhism, Protestant Christianity, and Catholicism. South Korea has a highly developed economy ranked 11th largest in the world, with key industries like electronics, automobiles, shipbuilding, and semiconductor manufacturing. Confucianism emphasizes obedience and loyalty in business culture. Collectivism and participative leadership are also important influences.