Sandbar

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Sandbar between St Agnes and Gugh on the Isles of Scilly, off the coast of Cornwall
A tidal sandbar connecting the islands of Waya and Wayasewa of the Yasawa Islands, Fiji

A sandbar, or shoal is a landform which is inside a body of water. Usually it is made of sand or pebbles. Currents and tides produce these landforms. Usually, sandbars are long and narrow. Some are only visible at low tide.