BURSA, TURKEY - JANUARY 21: Visitors sled with a tractor at Gokoz Natural Park, located on the southern skirts of Uludag, after snowfall and cold weather froze the Gokoz Pond during winter season in Keles district of Bursa, Turkey on January 21, 2021. Visitors to the region, where the air temperature drops to 20 degrees below zero, can do activities such as sledding with a tractor, ATV safari, trekking and horse riding around the frozen pond. Sergen Sezgin / Anadolu Agency/ABACAPRESS.COM