QUIZ..Where is this island?

During flying from Jeju to Cheongju, I got a picture of ...one island.
Could you find it on google earth or naver map? or Daum map...?

QUIZ.
Where is the island in the first picture?( 2nd, 3rd pictures are series pictures and hint)

Hint:
1. The island is located in the South Korea.
2. You can find it easily  with a Korean map.

Map Links;
1. Google map
2. Naver map(korea)
3. Daum map(korea)

Answer with a map link...

LET'S start a flying picture quiz!!!