Where did the Germans expect an Allied invasion to occur?

Calais. For every Allied reconnaissance flight over Normandy, two were flown over Calais to increase the deception. The Germans expected that George Patton rather than Bernard Montgomery would be leading the invasion, so a dummy army under Patton was created to indicate that Calais was the objective. Another dummy army in Scotland was created to confuse the Germans into thinking that Norway might also be a possible site for the invasion.