Kkotji runs about five kilometres of fine pale sand down the western side of Anmyeondo, the long island at the southern end of the Taean peninsula. It is within Taeanhaean National Park, which is why the development behind it is lower and thinner than at Daecheon.
The two rocks are the thing. Halmibawi and Harabibawi — grandmother rock and grandfather rock — sit just offshore, cut off by the tide twice a day and walkable the rest of the time. The sunset lining up between them is rated one of the three best on the west coast.
Anmyeondo is connected to the mainland by bridge, so you can drive here from Seoul in about two and a half hours. Buses go via Taean town.