Wikipedia

1.Yeonpyeong Island;
2.Baengnyeong Island;
3.Daecheong Myeon;
4.Jung-gu (Incheon Intl. Airport);
5.Seoul;
6.Incheon;

A. Northern Limit Line (NLL, the border claimed by South Korea since 1953)
B. Military Demarcation Line (the border claimed by North Korea since 1999)