Washington Post Map Of Known U.S. Military Drone Bases In The Middle East and Africa

The sites are marked in red at these locations: 

Incirlik Air Base, Turkey

Qatar 

United Arab Emirates

Camp Lemonnier, Djibouti

Arba Minch, Ethiopia

Victoria, Seychelles

Niamey, Niger

According to the Washington Post, there are two sites in Niger and another in Chad.