Q. Ogaden region has been a source of conflict between which countries?
Answer: Ethiopia and Somalia
Notes: The Ogaden region, a Somali-inhabited territory in eastern Ethiopia, has been a major flashpoint between Ethiopia and Somalia. The conflict peaked during the 1977-1978 Ogaden War, when Somalia invaded to claim the region, leading to intense fighting until Ethiopia, backed by Soviet and Cuban forces, repelled them. This dispute stems from ethnic Somali populations and irredentist claims, with sporadic clashes continuing, including in the 2000s amid Somalia's instability. No conflicts link Ogaden to the other options: Morocco-Algeria involves Western Sahara; Nigeria-Cameroon, Bakassi Peninsula; Angola-Zambia, border issues.