The snow depth currently is at 40 centimeters (15.7 inches), while the surface of the lake froze after temperatures dropped to -16 centigrade degrees (3.2 Fahrenheit).
The natural wonder in snow blanket attracts local and foreign holidaymakers.
Conveniently located between Ankara and Istanbul, Bolu is famous for nature lovers with lakes, an international ski resort and forests that cover 65% of the city.
There are 30 thermal springs in the Seben, Göynük, Mudurnu, Karacasu and Taşkesti districts of Bolu and the heat of the water is between 20 Celcius (68 Fahrenheit) and 90 Celcius (194 Fahrenheit).
