Transversely, the Adriatic Sea is also asymmetric: the Apennine peninsular coast is relatively smooth with very few islands and the Monte Conero and Gargano promontories as the only significant protrusions into the sea; in contrast, the Balkan peninsular coast is rugged with numerous islands, especially in Croatia.
Transversalmente, o mar Adriático tamén é asimétrico: a costa peninsular dos Apeninos é relativamente lisa con moi poucas illas e os promontorios de Monte Conero e Gargano como as únicas protuberancias significativas no mar; en contraste, a costa peninsular balcánica é accidentada con numerosas illas, especialmente en Croacia.