Which waterway separates Europe from Asia at Istanbul?

The Bosphorus separates Europe from Asia at Istanbul.

The Bosphorus is a narrow natural strait connecting the Black Sea in the north with the Sea of Marmara in the south. Istanbul stands on both of its banks, making it one of the world’s most prominent cities located across two continents. The European and Asian sides are linked by several bridges and transport tunnels.

The strait is about 31 kilometres long, though its width varies considerably. It is an important international shipping route, particularly for vessels traveling between the Black Sea and the Mediterranean through the Dardanelles and the Aegean Sea.

The Bosphorus is not the same waterway as the Dardanelles. Together, the two straits form the Turkish Straits system, but the Dardanelles lies farther southwest and connects the Sea of Marmara with the Aegean. The name Istanbul applies to the modern city on both sides, while the surrounding country is Türkiye, formerly commonly called Turkey in English.