What are shallow body of water that has an opening to the ocean and is protected by sand bar?

Shallow bodies of water that have an opening to the ocean and are protected by sandbars are commonly referred to as lagoons. These coastal features can serve as habitats for various marine and bird species, and they often have a mix of saltwater from the ocean and freshwater from rivers or streams. The sandbar acts as a natural barrier, helping to shield the lagoon from strong ocean waves and currents. Lagoons can be found in various geographical locations and play important ecological and recreational roles.