United States, Minnesota, Roseau, Releve 50, Marvin Lake Fen, 1 mi SW of Marvin Lake and 8 mi NW of Warroad, moss mat adjacent to releve 49; NE1/4 SW1/4 S Releve 50, Marvin Lake Fen, 1 mi SW of Marvin Lake and 8 mi NW of Warroad, moss mat adjacent to releve 49; NE1/4 SW1/4 Sec. 32 T164N R37W. 164N 37W 32