a ridge or shoal of sand below high tide, formed in a river or along a shore by the action of currents or tides
also written sand bar
A long mass or low ridge of submerged or partially exposed sand built up in the water along a shore or beach by the action of waves or currents.
- The island we know as "Ellis Island" is a 3.3 acre sandbar near the mouth of the Hudson River.
- This subsidiary basin is separated from the Caspian by a narrow sandbar, pierced by a strait 14 m.
- Originally an island, this headland was in classical times, as now, connected by a narrow bar with the lower promontory of Hagios Nikolaos on the north; it is now united to the mainland also by the sandbar already mentioned.