The Bukhan-san Sub-Range especially Samgak-san 삼각산 840m and Inwang-san 인왕산 388m, and also including An-san, Bugak-san, Dobong-san, Sapye-san, Surak-san, Bulam-san and Acha-san. North and East of Seoul City. Some of these are in the Bukhan-san National Park, others are Local Parks.
Jiri-san 지리산 Gurye County of South Jeolla Province; Hadong, Sancheong and Hamyang Counties of South Gyeongsang Province; and Namwon City of North Jeolla Province; National Park, Cheonhwang-bong 1915m, Banya-bong 1733m & Nogo-dan 1507m
Halla-san 한라산 Jeju-do Province & Island, National Park, 1950m
Eastern Korea:
Baekdu-san 백두산 DPRK and China border, National Park, 2850m
Geumgang-san 금강산 DPRK Gangwon Province, National Park, 1908m Famous as the "Diamond Mountains"
Taebaek-san 태백산 Gangwon Province, Taebaek City, Provincial Park, 1567m (including Hambaek-san of Taebaek-shi, and Cheong-ok-san, Guryong-san and Eungbong-san of Bonghwa & Uljin Counties)
Geumjeong-san 금정산 Busan City, City Parks, 802m (including Sanggye-bong, Sanghak-san, Baekyang-san, Eumgwang-san, Gubong-san and Yongdu-san)
These 9 mountains are the ones I have judged to be Korea's holiest, by the criteria explained on this page and my 20 years of visiting them and studying this subject. They break down in a convenient and balanced split between 5 in the central and western regions and 4 in the eastern regions (mostly, the Taebaek Range and its southern extension now dubbed the "Yeongnam Alps", going as far west in the southern region as the Nakdong River. They are listed here North-to-South. Only six mountains from the Democratic People's Republic of Korea (North Korea) are listed, due to our lack of information about historical and current mountain-worship traditions there; those six are labled "DPRK". Click on the name to see my photos and discussion of that mountain and its San-shin shrines.