1. The Arab slave trade: This was the largest pre-Columbian slave trade in Africa, with Arab merchants transporting slaves from East Africa to the Middle East and North Africa.
2. The Atlantic slave trade: This was the second largest pre-Columbian slave trade in Africa, with European merchants transporting slaves from West and Central Africa to the Americans.
3. The Trans-Saharan slave trade: This was the third largest pre-Columbian slave trade in Africa, with Arab and Berber merchants transporting slaves from West Africa to North Africa and the Middle East.
4. The Indian Ocean slave trade: This was the fourth largest pre-Columbian slave trade in Africa, with Arab and Indian merchants transporting slaves from East Africa to the Middle East and South Asia.
5. The Swahili Coast slave trade: This was the fifth largest pre-Columbian slave trade in Africa, with Arab merchants transporting slaves from East Africa to the Middle East and India.