Sinop Province in the context of "41st parallel north"

Sinop, historically known as Sinope (Ancient Greek: Σινώπη, Sinōpē), is a city on the isthmus of İnce Burun (İnceburun, Cape Ince) and on the Boztepe Peninsula, near Cape Sinope (Sinop Burnu, Boztepe Cape, Boztepe Burnu) which is situated on the northernmost edge of the Turkish side of the Black Sea coast, in the ancient region of Paphlagonia, in modern-day northern Turkey. It is the seat of Sinop Province and Sinop District. Its population is 57,404 (2022).

Samsun Province (Turkish: Samsun ili) is a province and metropolitan municipality of Turkey on the Black Sea coast. Its area is 9,725 km, and its population is 1,368,488 (2022). Its adjacent provinces are Sinop on the northwest, Çorum on the west, Amasya on the south, Tokat on the southeast on the east. Its traffic code is 55. The provincial capital is Samsun, one of the most populated cities in Turkey.

Boztepe Peninsula is a peninsula in the Black Sea region of Turkey. It is in Sinop Province. The midpoint of the peninsula is at about 42°01′30″N 35°11′00″E / 42.02500°N 35.18333°E / 42.02500; 35.18333

The link between the mainland (which itself is a bigger peninsula) to the west and Boztepe to the east is an isthmus of 1.5 kilometres (0.93 mi) length and only 300 metres (980 ft) width. Thus the peninsula looks like an island and it is sometimes called "island". The area of the peninsula is about 7 square kilometres (2.7 sq mi). The bay to the south of the peninsula (called İçliman) is a natural harbor sheltered from most winds except for the south east wind. Because of this advantage historically Sinop was one of the most active ports of the Black Sea coast before the Battle of Sinop in 1853.

Sinop District (also: Merkez, meaning "central" in Turkish) is a district of the Sinop Province of Turkey. Its seat is the city of Sinop. Its area is 442 km, and its population is 68,972 (2022).

Kastamonu Province (Turkish: Kastamonu ili) is a province of Turkey, in the Black Sea region in the north of the country. It is surrounded by Sinop to the east, Bartın, Karabük to the west, Çankırı to the south, Çorum to the southeast and the Black Sea to the north. Its area is 13,064 km, and its population is 378,115 (2022). The population density is 29 inhabitants per km. The provincial capital Kastamonu has a population of 128,707 (2022).