The territory that is now Guinea-Bissau was part of the transatlantic slave trade system, but it was not among the main departure regions overall.

The coast of Guinea-Bissau was part of what historians call the Upper Guinea Coast, which also included Senegal, Guinea, and Sierra Leone (more broadly connected via coastal networks).

In this region, enslaved people were taken through small coastal trading points rather than huge, centralized ports; through inland raids and conflicts involving local polities and regional trade networks; and through Portuguese and, later, other European trading systems, especially earlier in the trade. It was a major departure zone, though not as major as the largest regions.

The largest share of enslaved Africans transported across the Atlantic came from the Bight of Benin (modern Benin and nearby areas), the Bight of Biafra (modern southeastern Nigeria), and the Gold Coast (modern Ghana). These regions accounted for far higher export volumes, especially during the trade’s peak in the 1700s.

Guinea-Bissau’s role was smaller because it had fewer large, centralized coastal slave-export ports than the eastern regions. Early Portuguese dominance eventually shifted to stronger trade networks elsewhere, and it experienced relatively lower sustained export volumes over time compared with the major “bights.”

While Guinea-Bissau may not be widely recognized for a specific monument called the “Door of No Return,” the region played a significant role in the Atlantic slave trade via its coastal ports and islands managed by Portuguese traders.

One of the most important historical sites is Cacheu, an old slave-trading port on the Cacheu River. Enslaved Africans were transported from this region to the Americas during the period of Portuguese colonial rule. Today, Cacheu contains a fort and a memorial museum connected to that history.

Another significant area is the Bijagós Archipelago, whose islands were affected by slave raiding and colonial trade networks.