The name given to the fresh water which drains off the land after a period of heavy rain and increases the flow of the ebb tide as it recedes from estuaries and the mouths of large tidal rivers, carrying the land silt to a considerable distance out to sea and discolouring the water. Thus, the freshes of the Nile are well known for carrying sand many kilometres to seaward, turning the water yellow. Other rivers whose freshes are notorious for the distance they discolour the water are the Amazon, Congo, Mississippi, Indus, Ganges, and Rhône. In the early days of navigation, these freshes were often used as a useful indication of a ship's position.
Subjects: Maritime History.