What is a marsh?

A marsh is characterized as a wetland area that is typically found at the edges of lakes, ponds, or rivers, where water is present either seasonally or year-round. This environment is dominated by herbaceous plants, such as grasses, sedges, and wildflowers, which thrive in saturated soil. The presence of standing water creates a unique ecosystem that supports a diverse range of wildlife, including various bird species, amphibians, and aquatic insects. In contrast, the other choices describe different types of ecosystems or landforms that do not accurately represent the defining features of a marsh. The correct answer highlights the importance of water presence in shaping the biological and environmental characteristics of a marsh.