The commune is accessed by the D23 road running east from Vibersviller to the village then continuing east to Harskirchen.
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Altwiller is located some 20 km south of Sarreguemines on the German border and some 50 km north-east of Nancy.
He approved the settlement of what became known as 'Seven Gallic Villages': Altwiller, Burbach, Diedendorf, Eywiller, Goerlingen, Kirrberg, and Rauwiller.