Boseong County, South Jeolla Province (South Korea)

So, here is flag, white with mark.
http://www.joongdo.co.kr/main/view.php?key=20180917010007196
Tomislav Šipek, 28 November 2019

From the Beoseong County website:

Boseong is surrounded by the fertile soil, fishery resources, and thick forests. The focal points of the flag are mountains and the ocean.

• [Description] It represents the three Scenic Vistas and the three Treasures: the wooded forests, clean ocean waters, green tea, and So-ri (Singing) of Boseong.
• Diamond-shaped Outline - Symbolizes the value of Boseong County.
• Each Corner - Symbolizes progress of Boseongians toward the Fourth Direction.
• Green - Symbolizes the thickly wooded forest and the spirit of Boseongians.
• Engraved Green Tea Leave - Symbolizes the tea fields (Highest Productivity of Green Tea).
• Wave shape - Symbolizes the zest and sorrow of Boseongians and So-ri (Singing) of Boseong.
• Blue : Symbolizes clear and clean Lakes and Ocean.

researched by Phil Nelson, 8 October 2005