You searched for: Place Allegan State Game Area, ca. 3.75 miles NE of Fennville, in the southern central portion of the Ottawa Marsh, ca. 225 meters NE of boat launch. Remove constraint Place: Allegan State Game Area, ca. 3.75 miles NE of Fennville, in the southern central portion of the Ottawa Marsh, ca. 225 meters NE of boat launch. Topic Potamogetonaceae Remove constraint Topic: Potamogetonaceae