Kammala jumla mai zuwa: Mafi mahimmancin halayen Namhansanseong ya ta'allaka ne da fa'idar yanayin sa; akwai sararin samaniya, madaidaiciya da ake kira Gorobong, tare da ƙananan cibiyar da manyan gefuna sama da 480 m sama da matakin teku, tare da kasancewa babban dutse a kan filayen filayen don sauƙin lura da yankin da ke kewaye. Saboda waɗannan halayen, Namhansanseong ya zama matsayin matsayi na umarni tun lokacin da aka haɗa Silla a ƙarni na 7. Hadaddiyar Silla ta gina kagara ta Jujangseong inda Namhansanseong ke zaune a yau don mazauna maza da kuma adana kayayyaki lokacin da yake yaƙi da Daular Tang a ƙarni na 7. A cikin karni na 13, a lokacin daular Goryeo, Namhansanseong ya kasance mai ƙarfi a kan
Mamayar Mongol. Tun karni na 17, Namhansanseong, kusa da babban birnin Seoul, ya girma sosai a matsayin sansanin tsaunuka, yana aiki a matsayin babban birnin gaggawa ga Sarkin Joseon.