Sinop: Türkiye's Northernmost Town and Its Prison Fortress

✓ Last reviewed: 29 September 2026 — Verified and updated by İlyas Bayrak, licensed Turkish guide (licence 070867), with the My Turkey Adventure editorial team. Prices, opening hours, transport fares and visa rules reflect the latest 2026 guidance. Quick Answer: Sinop, Türkiye, is a captivating Black Sea port city defined by its dramatic peninsula, ancient history, and infamous prison. It is absolutely worth visiting for travellers seeking an authentic slice of Black Sea Turkey , famous for its formidable fortress, the legacy of the philosopher Diogenes , and stunning natural landscapes. This Sinop travel guide will show you why it's a highlight of any off-the-beaten-path journey in Turkey. Fact Detail Location Sinop Province, the northernmost point of Anatolian Türkiye . Period / Type Ancient Greek colony, Seljuk/Ottoman port, Fortress Prison Museum. What It Is A historic peninsula city with ancient walls, a notorious prison, and unique natural formations. UNESCO Status The Erfelek Waterfalls are on the Tentative List ( 2020 ), but the city itself is not inscribed. Entry Small entry fees are required for the Sinop Fortress Prison and museums. Last checked September 2026 , confirm locally. Typical Visit Length 2 full days. Nearest Airport Sinop Airport (NOP) . Driving Time Approx. 2.5 hours from Samsun ; 7-8 hours from Istanbul . Best Months June to September for the best weather and swimming. What Is Sinop and Where Is It Located? Perched on the northernmost tip of Anatolia, Sinop is a city where geography and history are deeply intertwined. The city occupies a narrow, boomerang-shaped peninsula called the Boztepe Peninsula , which creates two distinct and sheltered natural harbours—an invaluable asset since antiquity. This unique setting on the Black Sea coast has made Sinop a strategic port for millennia. As you stand on its ancient ramparts, with the sea on both sides, you feel a sense of isolation and importance that defines the character of this incredible cor