A number of rivers flow into the Bras d'Or Lakes; so why are they so salty.

Compared to the total volume of water in the Lakes the input from rivers is very small. If the Lakes were empty, it would take 7 years to fill them with river water. Fresh water stays mostly on the surface and leaves the Lakes through the Great Bras d'Or Channel. This low salinity water is replaced by much saltier water flowing in along the bottom from Sydney Bight.

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