How is a coastal marsh formed?

A coastal marsh is formed through a combination of sediment deposition, tidal action, and the growth of salt-tolerant vegetation. As rivers carry sediment to the coast, these materials accumulate in tidal areas, creating a substrate for plant growth. The periodic flooding from tides allows water to nourish these plants while also promoting the buildup of organic matter, further enhancing the marsh's structure. Over time, this process leads to the development of a rich ecosystem that supports a variety of wildlife.