Qiǎnhǎi yángguāng chōngzú, shānhú zhǎng de hěn màoshèng.
Shallow seas get plenty of sunlight, so coral grows thickly there.
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The opposite is 深海, the deep sea. In geography 浅海 is the water over the continental shelf, down to about 200 metres, where most of the world's fishing happens.