The Solimões-Japurá moist forests (NT0163) is an ecoregion in northwest Brazil and eastern Peru and Colombia in the Amazon biome.

It has a hot climate with high rainfall throughout the year, and holds one of the most diverse collections of fauna and flora in the world.

The Solimões-Japurá moist forests has an area of 16,757,223 hectares (41,408,000 acres) divided among Colombia, Brazil and Peru.

The Putumayo River, which defines the border between Peru and Colombia, runs through the region, which is also drained by the Caquetá, Napo and Solimões.

There is a variety of soil types, but most are oxisols and ultisols poor in nutrients and high in aluminum and iron.

The whitewater rivers carry organic and mineral sediments washed down from the Andes, which they deposit during the annual floods, so the soils in the floodplains are richer in nutrients than in the terra firme areas.

Commercially valuable timber trees include Virola surinamensis, Cedrela odorata and Carapa guianensis.

181 species of mammals have been recorded including equatorial saki (Pithecia aequatorialis), golden-mantled tamarin (Saguinus tripartitus), Goeldi's marmoset (Callimico goeldii), jaguar (Panthera onca), margay (Leopardus wiedii), Sechuran fox (Lycalopex sechurae), southern little yellow-eared bat (Vampyressa pusilla), Schmidts's big-eared bat (Micronycteris schmidtorum), South American tapir (Tapirus terrestris), giant anteater (Myrmecophaga tridactyla), silky anteater (Cyclopes didactylus), southern tamandua (Tamandua tetradactyla), long-nosed armadillo (Dasypus), gray brocket (Mazama gouazoubira), red brocket (Mazama americana) and West Indian manatee (Trichechus manatus).

[3] Endangered mammals include white-bellied spider monkey (Ateles belzebuth) and giant otter (Pteronura brasiliensis).

Birds endemic to the ecoregion or rarely found elsewhere in the Amazon region include ashy-tailed swift (Chaetura andrei), blue-tufted starthroat (Heliomaster furcifer), pavonine quetzal (Pharomachrus pavoninus), white-eared jacamar (Galbalcyrhynchus leucotis), ochre-striped antpitta (Grallaria dignissima), Salvin's curassow (Mitu salvini), and golden-winged tody-flycatcher (Poecilotriccus calopterus).

Fish include silver arowana (Osteoglossum bicirrhosum), tetras (Hyphessobrycon and Bryconops genera), piranhas (Serrasalmus genus) and ocellate river stingray (Potamotrygon motoro).

The Cahuinari and Amacayacu national parks in Colombia protect 8,690 square kilometres (3,360 sq mi) of rainforest.