sand bar
From Longman Dictionary of Contemporary EnglishRelated topics: Oceanography, Geology, Geographysand barˈsand bar noun [countable] HEOa long pile of sand in a river or the ocean, formed by the movement of the waterExamples from the Corpussand bar• A sand bar was dredged, allowing the passenger and excursion steamers to make better use of the port.• The Kumbukan river rises with the first rains and breaks down the sand bar between itself and the sea.