The longest sand spit on earth is the Curonian Spit.
Well, do you mean a sand SPIT?
spit
spit forms as a result of deposition by longshore drift
Beaches, Sand bars and Spits.
spit forms as a result of deposition by longshore drift
Where a coastline turns and interrupts longshore drift, sand may be deposited in a fingerlike landform called a spit.
Sand Spit: A sand spit is an elongated line of sand that usually extends parallel to shore. Barrier Islands: Barrier Islands are long,narrow coastal island.
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A "sand spit" is an elongated line of sand (or sandbar) that usually extends parallel to the shore, connected to the mainland. If it grows high enough to survive tides, it can become a peninsula. If it is separated from the land after forming, it can become an offshore barrier island.
Sand? Spit? Isle?
The difference is that a spit is that one end of a spit is connected to the shore, and the other end is in the ocean. A sand bar is close to the shore, but is not attached to it. Sandbars can be underwater or poking out of the surface of the ocean. Below are some links for images to help you get the idea.