Partnership for the Delaware Estuary
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The Partnership for the Delaware Estuary (PDE) is a regional nonprofit organization working to protect and enhance the Delaware Estuary, where fresh water from the Delaware River mixes with salt water from the Atlantic Ocean. Established in 1996, its mission is to lead science-based, collaborative efforts to improve the tidal Delaware River and Delaware Bay, which span Delaware, New Jersey, and Pennsylvania.
The Partnership for the Delaware Estuary is one of 28 National Estuary Programs throughout the coastal United States working to improve the environmental health of the nation's estuaries. Its staff works with partners in three states to increase awareness, understanding, and scientific knowledge about the Delaware Estuary, a major regional cultural, economic, and recreational resource.

The Delaware Estuary is the tidal portion of the Delaware River Basin. It includes all of the watersheds draining into this portion of the Delaware River and Delaware Bay. The area surrounding the estuary stretches as far west as the Schuylkill River's headwaters near Pottsville, Pennsylvania, and as far east as the Rancocas Creek's headwaters near Fort Dix, New Jersey. The vastness of this watershed makes the Delaware Estuary one of the largest estuaries in the country, or approximately 6,800 square miles (18,000 km2) in size. Within these boundaries are over 200 species of fish, the continent's second-highest concentration of shorebirds, and over 400,000 acres (1,600 km2) of wetlands.[citation needed]