[1] The river flows through the Kintamo Rapids at its mouth, described by the English explorer Henry Morton Stanley on 12 March 1877 as having an impressive beauty rarely equaled.

[2] At its mouth the river flows through the 2,500 hectares (6,200 acres) Ramsar site no.1857, Les Rapides du Congo-Djoué.

It includes rapids, permanent and temporary rivers, marshes, forested islands and aquaculture ponds.

Although protected by law, there is no management plan in place, and the site is used for market gardening, fishing and harvesting of wine palm oil.

[6] There is a gravity dam with a 24 metres (79 ft) head and hydroelectric power plant on the river less than 10 kilometres (6.2 mi) from the city center, built in the 1950s.