A vast estuarine reserve on the South Carolina coast, protecting tidal marshes, blackwater rivers, and rich coastal heritage.
Ashepoo Combahee Edisto Basin National Estuarine Research Reserve
The Ashepoo Combahee Edisto Basin National Estuarine Research Reserve is a large estuarine reserve on the Atlantic coast of South Carolina, covering approximately 140,000 acres within the broader ACE Basin. The ACE Basin is one of the largest undeveloped estuarine complexes remaining on the United States eastern seaboard, formed where three rivers meet the biologically rich waters of St. Helena Sound.
The reserve is named for the Ashepoo, Combahee, and Edisto Rivers, which wind through cypress swamps, tidal marshes, historic plantation landscapes, and former rice fields before emptying into the Atlantic. It exists to safeguard the natural environment, wildlife, and cultural heritage of this coastal region, including the habitat of several endangered and threatened species.
In addition to conservation, the reserve supports ongoing scientific research, water-quality monitoring, and education for decision makers, students, and the public. Commercial fishing for shrimp, crab, oyster, clam, and finfish remains an important regional activity within the basin, and the reserve works to balance that resource use with long-term ecosystem protection.