Simplify the following text for a Grade 6 native English-speaking person.
Original: Saint-M Ã dard-de-Guizi Ã res is a commune in the Gironde department in Aquitaine in south-western France .
Simplified: Saint-M Ã dard-de-Guizi Ã res is a commune . It is found in the region Aquitaine in the Gironde department in the southwest of France .