From a tornado looming above Colorado to an orangutan using a leaf as an umbrella: National Geographic reveals its top pictures of 2015 (6)

Tugo Cheng. As the largest mountain ranges in Central Asia, Tian-shan ('sky-mountain' in Chinese), has one of the best collections of natural landscapes in the world and is seen by many as a paradise for outdoor adventures. Thanks to the richness of sediments compounded with the power of erosion by rivers flowing down the mountains, the north face of Tian-shan is carved into stunning plateaus and colorful canyons hundreds of meters deep, resulting in this surrealist painting in nature