Soudan is a commune in the Loire-Atlantique department in western France. The river Verzée rises in the north-western part of the comm…Soudan is a commune in the Loire-Atlantique department in western France. The river Verzée rises in the north-western part of the commune, then flows eastward through its northern part; the river Chère rises in the southern part of the commune, then flows northwestward through its western part.