this picture was taken in Ningde, Fujian province, China. The black lines are very low dikes built intentionally by local fishermen for trapping seashells. Everyday, when the high tide is coming, it brings seashells over, and the seashells love to dig holes and get into the mud. When the tide is gone, the mudflat expose to the sky and the shells will be stuck there to be picked up easily. But when the tide is on half way, this shore becomes photographers love. the mud dikes make fabulous view and change the scenery all the time till they are all covered by water.
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