sandbank
/ˈsændˌbæŋk/
noun
- A submerged or partly exposed ridge of sand in a sea, river, or lake, formed by currents or tides.
- Fishermen know to avoid the sandbank because the water is too shallow there.
- The boat ran aground on a hidden sandbank near the mouth of the river.
- At low tide, the sandbank emerges and becomes a popular spot for seabirds.