Couple of years ago, I found a chance to visit Yedigöller National Park. It is a magnificent place with it's nature.
Yedigöller National Park is located in the Western Black Sea region and north of the province of Bolu.
Park has a rugged terrain and has lush vegetation. It is also accessible throuhout the year. But it can be a little hard to reach there in winter. :)
There are seven landslide lakes in the park and numerous streams.
Yedigöller National park actually located between Istanbul and Ankara. That's why this park is a popular destination.