 The Southwest Louisiana National Wildlife Refuge Complex was formed by administratively combining the Cameron Prairie National Wildlife Refuge, East Cove National Wildlife Refuge, Sabine National Wildlife Refuge, Lacassine National Wildlife Refuge, and the "Shell Keys NWR" in 2004.Due to coastal erosion, the refuge boundary is not well defined.It has been described as "... a small group of unsurveyed islets located in the Gulf of Mexico about three and one half miles south of Marsh Island (Louisiana), and approximately at latitude 29 degrees 26 minutes north, longitude 91 degrees 51 minutes west from Greenwich..." The boundary of the refuge has been interpreted to be those areas in this vicinity that are above mean high tide.