Important in terms of what? Business? Tourism? Population size?
They are rocky hot and suburbin.
Russia is mainly made up of plains, particularly steppes in the South. In the North, there is a lot of Tundra - frozen (e.g. Siberia)
Well the main one would be farming, but you could build buildings in them?
Bogota,Cali,Medellin,Cartagena,Santa Marta,Barranqueilla,Leticia,villavicencio, Cucuta,Bucaramanga,Manizales, Buenaventura...