United States, Florida, Nassau Co., In and just NE of powerline right-of-way, ca. 1 air mi. NW of its crossing of Lake Hampton Road (FL 121), ca. 1.4 air mi. NE of Boulogne, just above St. Marys River floodplain; St. Marys Conservation Area. T4N, R23E, Sec. 41, NW¼.