신라 때 4명의 화랑이 하루만 놀다 가려 했지만 아름다운 경치에 흠뻑 취하여 사흘을 놀다 갔다 하여 삼일포라는 이름이 붙어졌다.
During the Silla period, four warrior youth tried to go to play for only one day, but they were soaked in the beautiful scenery and played for three days, so it was named Samilpo.