Dōkai Bay
, located in Kitakyushu City, Japan, is a long, narrow inland waterway-like bay measuring five to six hundred meters wide and 13 kilometers long. In modern times, it faces heavy industry, heavy industrial areas and once suffered from severe pollution and water contamination, but after a long period of successful purification efforts, the water quality has improved and the ecosystem has recovered. Physical geography Dōkai Bay, located in the northern part of Kyushu, Kyushu island, streches from the sea () on the east side of the island to the west into the land. It is long and narrow, shaped like waterway, and measures five to six hundred meters wide and 13 kilometers long. The average depth is shallow, about 7 meters. The formation of Dōkai Bay is closely related to the Quaternary cooling. During Quaternary glaciation, the last glacial period, rivers formed a valley here. There are rivers that flow into the bay, including , but they are all small and they all flow into the ba ...
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