The country's dependent territories are offshore and have distinct geographies of their own; the majority are islands. The third-largest country in the world (after the Russian Federation and Canada), the USA has an enormous diversity of geographical features, including mountains, plains, and coastal zones. Though there are many cities that are densely populated with more manmade features than natural ones, there are also vast rural areas that are far more sparsely populated. The climate ranges from subtropical to arctic, with a corresponding breadth of flora and fauna. For a more detailed description of each region's geographical characteristics, see the individual state sections.