Well-known for its uncontaminated clear waters, Hallyeohaesang National Park was the country's first national marine park. The park is divided into six sections, spanning over the regions of Jisimdo Island in Geoje to Odongdo Island in Yeosu. The total area is 535.676 ㎢, of which 76% consists of ocean water. The park is visited by over one million tourists every year for its scenic landscape and beautiful waters.