Disputes - international:
since 2003, ad hoc armed militia groups and the Sudanese military have driven hundreds of thousands of Darfur residents into Chad; Chad wishes to be a helpful mediator in resolving the Darfur conflict, and in 2010 established a joint border monitoring force with Sudan, which has helped to reduce cross-border banditry and violence; only Nigeria and Cameroon have heeded the Lake Chad Commission's admonition to ratify the delimitation treaty, which also includes the Chad-Niger and Niger-Nigeria boundaries

Refugees and internally displaced persons:
refugees (country of origin): 297,296 (Sudan); 64,673 (Central African Republic); 14,162 (Nigeria) (2015)
IDPs: 92,000 (majority are in the east) (2015)