- The John Heinz National Wildlife Refuge at Tinicum is the largest freshwater tidal marsh in Pennsylvania. The mission of the refuge is to preserve the marsh, promote environmental education and provide visitors with an excellent opportunity to observe wildlife in its natural habitat. The Heinz refuge offers nature programs, environmental education workshops, field trip consultations and a resource library. All workshops, field trips and related services are offered free of charge. The Refuge is an excellent resource for birdwatchers, hikers and nature lovers.
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