Sandbars are long, narrow areas of sand in a river or sea.
Sandbars can be dangerous for boats because they are shallow and can cause boats to get stuck.
Examples:
The boat got stuck on a sandbar.
We walked on the sandbar at low tide.
The sandbar stretches across the river.
The sandbar made the boat stop suddenly.
The sandbar seemed to go on forever.
The sandbar was like a long, skinny island in the water.