Military installations established in 1931

census designated place in Pennsylvania, USA

military base and biological laboratory in US

thumb|upright|Aerial view of the fort of Madama, November 2014 Madama is a border settlement on the northeast frontier of Niger. Little more than an army post, the settlement serves as a frontier station controlling travel between Niger and Libya. It is also the site of a former French colonial fort, built in 1931. The fort is now surrounded by barbed wire and a field of landmines. thumb|View on Fort Madama from the North, June 2017