Jeju Do island

Halla Mountain in Jeju highest mountain in South Korea. Treking in Jeju. Jeju-do (also spelled Chejudo) is Korea's largest Island, located well south of the western side of the peninsula. Above is a panorama of Jeju's natural beauty: under a typically cloudy sky, the 1950-meter peak of Halla-san dominates its alpine slopes, above jungle-thick coastal forests transversed by high gushing waterfalls.