Hanon-Maar, the largest and the only Maar in the Korean Peninsula has been neglected in a damaged state for a long and whose value has not been recognized. Moreover, recently it is facing the danger of thought-less development as well. Despite the overwhelming percentage of approval (99.7%) for Hanon-Maar restoration and preservation at the World Conservation Congress (WCC) 2012 and consecutive recommendations from the congress being given to the Korean government for the conduct of restoration project, past governments and Jeju Special Self-Governing Province has not been taking a step forward. Therefore, this forum for discussion is arranged so as to suggest Hanon-Maar as a significant national policy project with its value keeping the secret of ancient organism and paleoclimate for fifty thousand years and its appropri-ateness setting an international standard for restoration of natural environment.