Zonguldak is a city and the capital of Zonguldak Province in the Black Sea region of Turkey. It was established in 1849 as a port town for the nearby coal mines in Ereğli and the coal trade remains its main economic activity. According to the 2009 census, Zonguldak has a population of 108,792. The current mayor is Muharrem Akdemir, representing the CHP. Zonguldak is one of the highest income economies among Turkish cities. Wikipedia
A place in Turkey, Zonguldak is an interesting place to visit, given its unique culture, history and character. The nearest major city to Zonguldak is Sapanca. Sapanca is bestowed with interesting set of attractions for every type of traveller. Most online packages to this city are of 1-2 days.
Yes,it is that simple really! Enjoy your trip! Keep travelling!