과거에는 청옥산이 인근에 있는 두타산보다 51m나 높음에도 불구하고 청옥산과 두타산 전체를 일컬어 두타산이라 부르기도 했다.
In the past, both Cheongoksan Mountain and Dutasan Mountain were also referred to as Dutasan Mountain, although Cheongoksan Mountain was 51m higher than the nearby Dutasan Mountain.