Yatsushiro Sea, Inland sea between Kyushu and Amakusa Islands, Japan
Yatsushiro Sea is an inland body of water separating Kyushu from the Amakusa Islands, with shallow areas and rich marine habitats. The northern zone contains extensive mudflats that support a wide range of marine organisms and define the wetland ecosystems of the region.
The water suffered severe contamination from mercury discharge in the post-war years, triggering serious health crises among nearby populations. These events later spurred major environmental protection efforts and made the region a focus for discussions about industrial pollution.
The local fishing communities practice traditional methods passed down through generations, shaping what people eat and how they celebrate throughout the year.
The best time to visit is during warmer months when water conditions are more stable and visibility improves. Visitors can access the water from various points along the shoreline, though some areas become more accessible only at higher water levels.
On certain nights, mysterious lights called Shiranui appear on the water's surface, created by atmospheric refraction of fishermen's lanterns. This phenomenon is best observed from the shore when conditions align just right.
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