Tourism in South Korea refers to the tourist industry in the Republic of Korea. In 2012, 11.1 million foreign tourists visited South Korea, making it the 20th most visited country in the world, and the 6th most visited in Asia. Most non-Korean tourists come from other parts of East Asia such as Japan, China, Taiwan, and Hong Kong. The recent popularity of Korean popular culture, often known as the “Korean Wave”, in these countries has increased tourist arrivals. Seoul is the principal tourist destination for visitors; popular tourist destinations outside of Seoul include Seorak-san national park, the historic city of Gyeongju and subtropical Jeju Island. Traveling to North Korea is not normally possible without a special permission, but in recent years organized group tours have allowed groups of South Korean citizens to visit Mount Kumgang.