hallasan national park, jeju island, south korea, spring view of yeongsil trail with wooden ladder path stairs, trekking and

asia autumn eorimok eoseungsaengak female gwaneumsa halasan halla hallasan hike hiking infrastructure island jeju jejudo korea korean ladder landscape mountain mountains national nature panorama park path peak seogwipo seongpanak south spring stairway stairways summer summit tourism tourist trail travel trekking vacation volcano wilderness wooden yeongsil