Grand Bay WMA is located in the lower Coastal Plain physiographic province in what is typically known as "flatwoods." It is situated within a 13,000-acre wetlands system, which is the second largest natural blackwater wetland in the Coastal Plain of Georgia. Grand Bay is one of the land features known as "Carolina bays" which, according to one theory, were created by showers of meteors. The diversity of wildlife also compares favorably with that found in the Okefenokee.