The Pan-American Highway ( Route panaméricaine, Carretera Panamericana ) is a network of roads measuring about 47,958 kilometres (29,800 mi) in total length. Except for an 87 kilometres (54 mi) rainforest break, the road links the mainland nations of the Americas in a connected highway system. The Pan-American Highway passes through many diverse climates and ecological types, from dense jungles, to arid deserts, to cold mountain passes. Since the highway passes through many countries, it is far from uniform. Some stretches of the highway are passable only during the dry season, and in many regions driving is occasionally hazardous.