Welcome to the
Great Marsh

Supporting scientific studies, educational
opportunities, and protecting the unique
Great Marsh in Northern Chester County.

Our Mission

Chester County’s Great Marsh provides a unique habitat for the study of flora and fauna as well as the unique characteristics of the Periglacial marsh. It is the purpose of the Great Marsh Institute (GMI) to support scientific studies through access to the property, technical support, and opportunities for educational activities including funding for student interns.

Franklin & Marshall students testing the water quality of the Great Marsh.

Check out our research efforts here

Check out the fun things we do at the marsh here!