Greater Somalia refers to those regions in the Horn of Africa in which ethnic Somalis live. Greater Somalia thus encompasses Somalia (the former British and Italian colonial areas), eastern Ethiopia, Djibouti and northeastern Kenya. Pan-Somalism refers to the irredentist vision of unifying these territories under an enlarged Somali state. The pursuit of this goal has led to conflict, with Somalia engaging in armed warfare repeatedly with Ethiopia over the Ogaden region, as well as supporting Kenyan separatists in the Shifta War.
See more at Wikipedia.org...