Damascus (the capital city of Syria; an ancient settlement, the ancient capital of various polities, most notably the Umayyad Caliphate from 661 to 744 CE and Aram-Damascus, existing from the 12th to 8th centuries BCE)
Danube (a river in Europe; flowing 2,850 kilometers from the confluence of the Breg and Brigach at Donaueschingen, Germany, through Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova, and Ukraine, into the Black Sea)
Dauphin (a city in Manitoba, Canada); Dauphin (a commune of Alpes-de-Haute-Provence department, Provence-Alpes-Côte d'Azur region, France); Dauphin (a borough in Dauphin County, Pennsylvania, United States)