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Britannica Sources used in this answer

How does the Congo River form part of the border between Angola and the Democratic Republic of the Congo?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
Physical map of the Congo River basin and its drainage network in Central Africa, showing rivers, major tributaries, elevation gradients, cities, international boundaries, and the approximate boundary of the Ituri Forest. Swamps and flood-prone areas are marked in blue, with symbols indicating waterfalls, rapids, and dams. An inset locator map shows the basin's position within Africa.
Congo River

The Congo River serves as a natural boundary between Angola and the Democratic Republic of the Congo along the final 90 miles (145 km) of its course.1

This stretch of the river corresponds to the Congoā€™s estuary, which begins downstream from the rapids at Matadi. The estuary extends for 83 miles (134 km) before reaching the Atlantic Ocean. Throughout this section, the river acts as the international border between the two nations.21