Hiking in Chile is characterized by a wide range of environments and climates for hikers, which largely results from Chile's unusual, ribbon-like shape, which is 4,300 kilometres (2,700 miles) long and on average 175 kilometres (109 miles) wide. These range from the world's driest desert, the Atacama, in the north, through a Mediterranean climate in the center, to the glaciers, fjords and lakes of Patagonia in the south. The longest hiking trail in Chile is the informal 3,000 km (1,850 mi) Greater Patagonian Trail that was created by a non-governmental initiative.