This book analyzes the problem of illegal immigration in the Cameroon-Gabon-Equatorial Guinea cross-border zone. The author presents the perverse effects of this phenomenon within the tri-border area, still considered as a zone of opulence in the Cemac space, which represents a channel of economic growth for the three border states and their populations in the sub-region. However, the dynamics or the flow of uncontrolled migratory movements in full expansion here are increasingly affecting the political, economic and social cooperation of the various state actors in the zone. It has been established that this phenomenon is due to socio-anthropological, economic and historical factors linked to the major players involved in this illicit activity, namely: the populations, the road and sea transporters and the coastguards. Faced with this situation, the author proposes ways of resolving the problem, based firstly on measures specific to each state in the zone, and secondly on community measures, namely the effectiveness of sub-regional integration in the Cemac zone.