Dongdaesan (동대산) is the name of several mountains in South Korea: Dongdaesan (Gangwon), in Pyeongchang and Gangneung, Gangwon Province, 1,434 metres Dongdaesan (North Gyeongsang), in Pohang and Yeongdeok, North Gyeongsang Province, 791 metres Dongdaesan (Ulsan), 447 metres Dongdae Mountains