Which feature is formed where strong tides remove sediment deposited by a river?

The correct answer is estuaries, as they are unique regions where freshwater from rivers meets and mixes with saltwater from the sea. This mixing zone is influenced by tides, which can be quite strong in certain areas. When strong tides occur, they can effectively remove sediment that has been deposited by rivers. This dynamic process helps to shape the ecological and geological characteristics of the estuary.

In contrast, deltas are typically formed at river mouths where sediment builds up due to the slowing of river water as it enters a standing body of water, creating new land rather than removing it. Floodplains are adjacent to rivers and are formed from sediment deposited during flood events, creating fertile land, but they do not involve the tidal influence in the same way as estuaries. Meanders refer to the bends in rivers, shaped by the water’s flow and erosion, but again do not relate directly to the process of strong tides removing sediment. Thus, estuaries are the correct feature formed under the stated conditions.