Great Marsh is a large wetland area located in the northeastern United States, primarily in Massachusetts. It is known for its diverse ecosystems, including salt marshes, freshwater ponds, and tidal creeks. This habitat supports a variety of wildlife, including birds, fish, and plant species, making it an important area for biodiversity. The marsh plays a crucial role in flood control and water filtration, helping to protect surrounding communities from storm surges and pollution. It is also a popular spot for outdoor activities such as birdwatching, kayaking, and hiking, attracting nature enthusiasts and researchers alike.