Due to Sweden's northern location, the summer sun sets for only short periods of time. This phenomenon allows outdoor activities later in the evening than usual. Sweden has a large number of lakes and forests; the former is popular for fishing and canoeing. There are several large lakes, including lakes Vättern and Vänern. The Göta Canal from Stockholm to Gothenburg allows for trips in the summer. Hiking is popular in the summer, both in the forested regions as well as in the alpine landscapes. Mountain-hiking is limited to the northern and north-western parts of Sweden. In the south, the Swedish mountains are generally high rolling hills with some occasional pointy peaks, while the middle and particularly northern parts of the range gradually exhibit a more dramatic nature.