Cheongdo County, North Gyeongsang Province (South Korea)

Here is flag more correct with dimensions, 2:3
http://www.cdinews.co.kr/ArticleView.asp?intNum=9136&ASection=001002
http://www.fnnews.com/news/201505121357275556?utm_source=naverblog&utm_medium=blog
http://www.cheongdo.go.kr/open.content/ko/cheongdo/symbols/ci/
Tomislav Šipek, 22 December 2019

From the Cheongdo county website:

The county flag

It represents strong spirit and passion of Cheongdo residents as well as the development and growth of the county Red in left and right is bull horn patter symbolizes famous Choengdo bullfighting. Green and blue oval represents Cheongdo's green mountain and clear blue water. The shape is that of Cheongdo's special local products, persimmons and peaches Red oval with English logo symbolizes a bullring of Cheongdo's bullfighting and also harmonized Cheongdo county.

researched by Phil Nelson, 12 October 2005