Wouri estuary
The Wouri estuary in Cameroon is where several rivers meet and flow into the Bight of Biafra. Douala, the country’s largest city, sits at the mouth of the Wouri River as it enters the estuary. The area is known for its extensive mangrove forests, which are being damaged by pollution and growing settlements.
Geography and climate: The estuary lies in the Douala Basin, a low-lying area with many creeks, sand bars and lagoons. It is fed by the Mungo, Wouri and Dibamba rivers. Below the estuary sits a layered aquifer that supplies well water. The upper part of this aquifer connects with the estuary’s brackish water. The region receives a lot of rain each year (about 4,000–5,000 mm) and has very low surface salinity, especially during the rainy season. Spring tides at the mouth reach about 2.8 meters, and the Mungo River carries a tidal bore up to 40 kilometers upstream. The estuary is affected by tides for about 45 kilometers inland from Douala.
Mangroves and wildlife: Large mangrove forests line both sides of the estuary. The north shore has a long, deep mangrove belt, while mangroves on the south shore stretch toward Point Soulelaba. About 15,000 hectares fall within the Mouanko Reserve. The main mangrove species, Rhizophora racemosa, can grow up to 40 meters tall. An exotic mangrove, Nypa fruticans, is spreading. Mangroves provide wood, fuel and materials for building, and they help protect the coast from storms. The estuary is a global marine biodiversity hotspot, supporting waterbirds and serving as breeding grounds for fish, shrimp and other wildlife. It is recognized as a wetland of international importance under Ramsar.
Threats to the environment: Pollution and habitat loss threaten the estuary. Industrial, agricultural and household waste flows into the water, and logging and urban expansion reduce mangroves. Pesticides and untreated sewage are common problems, and the area around Douala’s industrial zones contributes to water pollution. Wetlands are shrinking, and fish stocks are declining. Pollution also brings health risks to people who depend on the estuary for food and livelihood.
People, history and economy: The estuary has long been home to several groups, including the Duala near the mouth, the Limba, Mungo and Isubu communities. Europeans began trading there in the 15th century, with the Duala becoming key traders. The area was annexed by Germany in 1884, then became part of the Cameroonian state after World War I and the colonial borders were drawn. Douala’s port expanded after World War II, boosting the city but leaving many people in informal settlements with limited services. Fishing is important to the local economy, with thousands of tonnes caught each year and a large portion exported. The mangroves support many fish and shrimp species, which are central to local protein intake and livelihoods.
Oil and future prospects: There is potential for oil and gas in the region, with exploration activity in nearby blocks.
In short: The Wouri estuary is a rich and vital ecosystem for people and wildlife, but it faces serious threats from pollution, deforestation and rapid urban growth. Protecting its mangroves and waters is essential for health, biodiversity and the future of Douala and the surrounding communities.
This page was last edited on 2 February 2026, at 11:27 (CET).