Skywatch Friday No. 42: Sea of Two Color (Yin-Yang Sea)
We also have a gold mine in Taiwan. It was in production till not too long ago. At early 20th century, there was almost a gold rush. The location is at the northeast corner of Taiwan. The river that goes through the gold mine still carries a lot of minerals such as copper and iron. When they mixed with the sea water, it forms a brown color layer about 3 meter thick that stays afloat near the river outlet.
As you can see in the photo, the sea closer to the shore has a brown color as compares to the sea further away. The sky was almost as blue as the ocean.