G-36 Gümeli Nature Monument is 398 hectares in size and is approximately 25 km from the town of Alaplı and approximately 78 km from the city center of Zonguldak. The monument area is a very important place in terms of both terrestrial ecosystem diversity and the special species it contains. The most striking among these is the natural Yew trees (Taxus baccata L.) stand, which has become the symbol of the Gümeli Natural Monument. In forestry, the term "stand" refers to a limited area where the natural forest with old trees survives for a long time. For this reason, masceres are unique areas. Standing out with its rarity, the natural yew stand contains trees aged 4120, 1994 and 1170 as of 2023. Again, there are many yew trees with an average age of between 300 and 500 years. Among them, the 4120-year-old Monument Yew tree (Taxus baccata), one of the 5 oldest trees found to be living in the world, was registered as a Natural Monument in 2008. The elevation, geographical and climatic characteristics of the place where Gümeli Nature Monument is located provide a living environment for trees such as beech and chestnut, as well as yew trees. There are natural underground water sources where the trees are mainly fed. The general structure of this forest, which is very valuable in terms of natural history, is of the temperate and humid Northern Forests type. This stand area is also one of the best preserved old forests in Turkey. In the examinations made around the mentioned site; It is known that the adjacent forest areas are also in the status of "natural old forest" and there are many old trees with monumental characteristics. The fact that Turkey contains the oldest yew trees, while these trees are on the verge of extinction, makes the area more important in terms of protection.

In Gumeli Nature Monument, which is a unique ecosystem, many mammal species such as Roe Deer, Red Deer, Brown Bear, Wolf, Jackal, Fox, Badger, Barn, Wild boar and many more sheltered in old forests such as Black woodpecker, Pied owl, Eared forest owl. bird species are widespread.