Hamsilos is scientifically classified as a ria, not a glacial fjord, despite its frequent local description as a fjord.
The area was once a strategic maritime hiding spot for ancient sailors due to its concealed, winding entrance.
The water in the bay is brackish, resulting from the mixture of freshwater runoff and Black Sea saltwater.
It is the northernmost point of the Anatolian peninsula.
The surrounding forest contains diverse vegetation including pine, beech, and hornbeam trees.
Hamsilos Koyu is a unique geological formation in Sinop, Türkiye, often characterized as a ria, or a submerged river valley. It is recognized as Turkey's only fjord-like formation, formed by the erosion of glaciers during the fourth geological period. The area is protected as a nature park and features a narrow, winding inlet that extends inland from the Black Sea. The landscape consists of lush green forests surrounding calm, brackish water. It serves as a habitat for various migratory birds and diverse flora. Walking paths surround the bay, allowing visitors to view the geological structure from different elevations. As of June 2026, the area remains an active nature reserve accessible to the public.
The high vantage point on the trail overlooking the winding entrance where the bay meets the Black Sea.
Wear sturdy walking shoes to navigate the uneven forest paths surrounding the inlet.
Bring insect repellent, as the humid, forested environment near the water can attract mosquitoes.
Pack your own food and water, as amenities within the immediate nature park area are limited.
Do not attempt to swim in the narrow inner channels where the current or depth can be unpredictable; stick to designated beach areas near Akliman.
Practice 'leave no trace' principles; do not litter or disturb the local wildlife, and stay on designated walking paths.
