Horn of Africa
- Djibouti (founding member, since 1986)
- Ethiopia (founding member, since 1986)
- Somalia (founding member, since 1986)
- Eritrea (admitted 1993, withdrew 2007, readmitted 2011)
Nile Valley
African Great Lakes
- Kenya (founding member, since 1986)
- Uganda (founding member, since 1986)
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