The average salinity is about 22 parts per thousand (o/oo). By comparison, Sydney Bight is around 28 to 30 o/oo; the Atlantic ocean ranges from 32 to 37 o/oo. The water in the Lakes is much saltier at depth than at the surface because of inflow of freshwater from rivers. The total amount of salt in the Bras d'Or Lakes is about 700 million tons.
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