Nyamasheke district is divided into 15 sectors (imirenge): Ruharambuga, Bushekeri, Bushenge, Cyato, Gihombo, Kagano, Kanjongo, Karambi, Karengera, Kirimbi, Macuba, Nyabitekeri, Mahembe, Rangiro, Shangi.
Nyamasheke was originally part of the colony of German East Africa, which included what are now Burundi, Rwanda and Tanganyika. Nyamasheke's Lake Kivu is the site of the first German colonial military post, founded in 1898 by Kapitan Berthe, a German Army officer. Shangi sector was chosen by the Germans for its strategic position on Lake Kivu border with the Congo. The site is also known for having served for the first Rwandan religious mass in 1899.
Area : 1,174Km2
Population (2012): 381,804 among them Male: 178,421 which is 46.74%
Female: 203,383 which is 53.26%
Density of Population (2012): 325hab/Km2