The municipality is located just south of the Arctic circle, on the southern side of the Saltfjellet mountains with the Svartisen glacier, Norway's second largest glacier. Some of the large mountains in Rana include Bolna and Nasa. Mo is so close to the Arctic Circle that parts of the sun is continuously over the horizon (Midnight sun) from early June to early July, and there is no darkness from mid-May to the beginning of August. But there is no true polar night in December. The Saltfjellet-Svartisen National Park is partly located in Rana. There are many valleys such as the Dunderland Valley and Grønnfjelldal.