United States, Florida, Monroe Co., Upper Sugarloaf Key, Upper Sugarloaf Key, Sugarloaf Hammocks, Florida Keys Wildlife and Environmental Area. Located W of Old FL 4A (C-939; dirt road) ca. 0.84 mi. S of US 1 at mile marker 19.9; just SW of Pirates Cove. N 24.65045°; W 81.51567°.