Trek the gorillas and hike the Bisoke! The Virunga volcanoes are a range of six extinct volcanoes and two active volcanoes (Congo). The Virunga volcanoes, with their altitudinal vegatation zones are probably one of the most beautiful mountains of the world. They are a paradise for hikers. Rwanda has 5 volcanoes, and the Bisoke (3.711 m) is an extict volcano, with a beautiful crater lake. Fantastic views in all directions!