The Eastern Congolian swamp forests (French: Forêts marécageuses de l'est du Congo) are a fairly intact but underresearched ecoregion of the tropical and subtropical moist broadleaf forests biome.

[4] The region has been insufficiently researched by zoologists but is known to be home to forest elephants (Loxodonta africana cyclotis) (which may have been reduced by poaching, especially near the larger rivers), and several primates, including the rare bonobo (Pan paniscus).

The Congo is a natural barrier to movement of wildlife and many species only occur on this eastern side of the river, including many primates: the bonobo and also Angolan colobus (Colobus angolensis), Wolf's mona monkey (Cercopithecus wolfi), golden-bellied mangabey (Cercocebus galeritus chrysogaster), black mangabey (Lophocebus atterimus aterrimus), southern talapoin (Miopithecus talapoin) and the Dryas monkey (Cercopithecus dryas).

[4] Endemic amphibians and reptiles include a small frog (Cryptothylax minutus), Chapin's chameleon (Trioceros chapini), a wall lizard (Gastropholis tropidopholis), the Zaire snake-eater (Polemon robustus), and a worm lizard (Zygaspis dolichomenta).

The Ngiri Ramsar Site, a designated wetland of international importance, covers a portion of the ecoregion.