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Why is dredging needed in parts of the Congo River estuary?

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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

Dredging is required in parts of the Congo River estuary because the river widens downstream of Boma and becomes obstructed by islands, causing it to divide into several arms. In these areas, the water depth can be as shallow as 20 to 25 feet (6 to 7.5 meters). Dredging is necessary to maintain sufficient depth to allow oceangoing vessels to reach the port of Matadi.1