ðə sˈʌðɚn bˈoːɹdɚɹ ʌv ɡwˈænækɡˈuː, bˈoːɹdɚɹɪŋ ˈɛnɪˌæŋ, kənsˈɪsts ʌvðə kɹˈæɡi ɹˈɪdʒlaɪn ʌv ɡwˈænæksən ˌɛmtˈiː. ɡwˈænæk, wˌɪtʃ dˈɑːmᵻnˌeɪts ðə lˈoʊkəl dʒɪˈɑːɡɹəfi.
The southern border of Gwanak-gu, bordering Anyang, consists of the craggy ridgeline of Gwanaksan (Mt. Gwanak), which dominates the local geography.