On September 27, Istanbul's iconic strait turned into a floating parade ground. Thirteen Turkish navy ships and two submarines sailed the length of the Bosporus to mark the 488th anniversary of the Battle of Preveza and Turkish Naval Forces Day, giving locals and visitors an unplanned spectacle against the city's skyline of minarets and bridges.
The Battle of Preveza, fought in 1538, saw the Ottoman fleet under the legendary admiral Barbarossa Hayreddin Pasha defeat a combined Christian naval force off the coast of northwestern Greece. It secured Ottoman dominance over the Mediterranean for decades, and it remains the founding legend of Türkiye's naval forces. Every September 27, the Turkish Armed Forces mark the anniversary with ceremonies, and the navy's passage through the Bosporus has become the most visible part of the commemorations.
There's a practical twist for travellers, too: the Bosporus is one of the world's busiest shipping channels, and naval movements can briefly pause passenger ferries and cruise traffic through the strait. If you're in Istanbul during the commemorations, expect some crossings to be held up for an hour or so, and check Bosphorus ferry timetables before heading to the waterfront.
For anyone visiting in late September, it's a free, photogenic event. Good vantage points include the waterfront at Beşiktaş and Karaköy, the slopes of Üsküdar on the Asian side, and any ferry crossing mid-strait. Ferry routes toward the Black Sea side offer views as the convoy passes, though passengers may be delayed by the security escort. Arrive early — the best viewing spots fill up quickly, and the mix of warships, submarines and ferries crowding the strait makes for a genuinely memorable scene.
