Baltic Sea (a sea in Northern Europe, an arm of the Atlantic enclosed by Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Poland, Russia and Sweden); Baltic, the Baltics, the Baltic states (a geographic region of Northern Europe, consisting of the three countries to the east of the Baltic Sea, i.e. Latvia, Lithuanian and Estonia; in full, the Baltics or the Baltic states)
Bosphorus (the narrow strait beside Istanbul, Turkey connecting the Black Sea to the Sea of Marmara, the northern end of the Turkish Straits connecting the Black Sea with the Aegean and Mediterranean)