What are the mountains that Dian Fossey studied in?

Dian Fossey's most famous work with mountain gorillas was conducted in the Virunga Mountains in Rwanda. Her research camp was called the Karisoke Research Center, because it was located on the saddle between Mt. Karisimbi and Mt. Visoke. Fossey's first work with mountain gorillas was in Zaire (now the Democratic Republic of Congo), but her work there was cut short by political upheaval. She moved her base of research to Rwanda after less than a year in Zaire. For more details, see http://en.wikipedia.org/wiki/Dian_Fossey