Addressing the summit, Chadian President Idriss Deby said Boko Haram would be uprooted from central Africa.
Heads of state attending the summit included Catherine Samba of the Central African Republic, Denis Sassou Nguesso of Congo-Brazzavile, Ali Bongo Ondimba of Gabon, and Teodoro Obiang Nguema of Equatorial Guinea.
For the last six years, Boko Haram has waged a deadly insurgency in Nigeria's northeastern region, leaving thousands dead.
In recent months, Boko Haram has mounted deadly attacks in Nigeria's neighbors – including Niger, Cameroon and Chad – prompting the latter to launch a joint counterterrorism campaign endorsed by the African Union and other regional bodies.