 Except for official tributary missions to China and the occasional diplomatic mission to Japan, which after the mid-eighteenth century became fewer and confined to the island of Tsushima, Koreans were prohibited from leaving the country.All foreigners were barred entry into the country except for official Chinese on diplomatic missions, and the Japanese who were only allowed to trade at a small walled compound, the "Waegwan", in Pusan.Foreign trade was mainly limited to China, conducted at designated locations along the Korean-Manchurian border and with Japan in Pusan.