AT A GLANCE
Why go?
The Ilgaz Mountains rise at the meeting point of Turkey's Central Anatolian plateau and Black Sea coast, reaching 2,587 m at their highest peak, Büyükhacettepe. Known in antiquity as Olgassys and today nicknamed the Sea of Trees for its dense fir and pine forests, this range is one of the western Black Sea Region's most striking natural landmarks. It straddles the provincial border between Kastamonu and Çankırı, and the state highway D.765 climbs through a dramatic pass at 1,850 m to link Ankara to the coast.↗↗↗
Winter turns Ilgaz into Turkey's most accessible ski destination—just 200 km from Ankara—while summer reveals a web of hiking trails, trout streams, and alpine meadows rich with rare endemic flowers. Mount Ilgaz National Park, established in 1976, protects the heart of the range and offers a rare combination of wilderness and well-served recreation.↗↗
A Mountain Range Between Two Worlds
The Ilgaz Mountains form the eastern section of the second parallel ridge inland from the Black Sea coast, stretching roughly 150 km east–west with an average width of 30 km. Their northern slopes drain into the Gökırmak River, the southern flanks feed the Devrez Creek, and both eventually join the Kızılırmak—Turkey's longest river. This hydrographic divide gives the range a transitional character: dry Central Anatolian climates press up from the south, while maritime moisture sweeps in from the north. The result is a zone of extraordinary ecological richness, recognized as an Important Bird Area, an Important Mammal Area, and an Important Plant Area.