Middle Elevations

Altitude range: 1,000 to 3,000 m a.s.l. / 3,300 to 9,800 ft a.s.l.

Bolivia’s middle elevations encompass a strikingly diverse range of ecosystems situated between the tropical lowlands and the high Andes. This elevation band includes two major biogeographical regions of ecological and ornithological significance: the Inter-Andean Dry Valleys and the Yungas—which are further divided into Northern and Southern Yungas.

🌄 Inter-Andean Dry Valleys

These valleys and basins lie in the rain-shadow zones of the eastern Andean slopes, receiving significantly less precipitation than surrounding regions. Characterized by deciduous woodlands, dry scrub, and arid montane vegetation, the Inter-Andean Dry Valleys exhibit strong seasonality in rainfall and are shaped by their rugged topography, with many isolated microhabitats and steep canyon systems.

This region is most continuous in the central Bolivian Andes but also includes more fragmented outposts in the northern Andes and in Tarija to the south. These valleys are home to some of Bolivia’s most specialized and range-restricted endemic birds, including: Cliff Parakeet, Red-fronted Macaw, Berlepsch’s Canastero, Bolivian Spinetail, Gray-bellied Flowerpiercer, Cochabamba Mountain Finch, Bolivian Blackbird.

In addition to their high endemism, these valleys are also culturally rich, historically home to a blend of Andean Indigenous groups and colonial settlements. Conservation challenges in this region include land-use change, water scarcity, and habitat fragmentation.

🌿 Northern Yungas (Tropical Andes)

Extending along the eastern slopes of the northern Andes, the Northern Yungas region is one of the most biologically rich and climatically wet regions in Bolivia. This humid montane forest zone spans from the upper foothills (~1,000 m) to the cloud forest belt and timberline at over 2,500 m. The ecosystem is defined by its lush evergreen vegetation, high rainfall, and steep altitudinal gradients, which create a series of ecological niches.

The Northern Yungas boasts some of Bolivia’s most iconic and endemic bird species, including: Horned Curassow, Black-hooded Sunbeam, Rufous-faced Antpitta, Bolivian Recurvebill, Black-throated Thistletail, Palkachupa Cotinga, Gray-bellied Flowerpiercer, and Bolivian Brush-Finch.
With 13 Bolivian endemics or near-endemics and at least 22 globally threatened species, the Northern Yungas ranks among the most critical areas for bird conservation in the entire Andes. It also supports charismatic mammals such as the spectacled bear, along with numerous orchid and bromeliad species.

🍃 Southern Yungas (Boliviano-Tucumano Forest)

Also known as the Boliviano-Tucumano Forest, this region forms the southern counterpart to the Northern Yungas. Found primarily on the east-facing slopes and ridges of the southern Andes, the Southern Yungas are characterized by semi-humid to humid subtropical montane forests with moderate rainfall seasonality.

This zone is patchier in distribution, often interrupted by dry valleys and open woodlands. The most humid and biologically productive areas are located on the eastern slopes of Chuquisaca, Tarija, and southern Santa Cruz.

While less studied than its northern counterpart, the Southern Yungas still harbors important endemic and range-restricted species, including: Bolivian Blackbird, and Tucumán Amazon.
In addition to birdlife, these forests are home to unique herpetofauna and invertebrates, many of which remain undescribed. Because of its biogeographic uniqueness and its function as a transition zone between Andean and Chaco ecosystems, the Southern Yungas is increasingly recognized as a key conservation priority.

In summary, Bolivia’s middle elevations are a treasure trove of endemism and biodiversity. From the arid dry valleys where macaws glide over cliff faces to misty cloud forests where rare cotingas and curassows call, these ecosystems represent some of the most diverse and ecologically significant landscapes in South America. For birders, naturalists, and researchers alike, the middle elevations offer unforgettable experiences—and vital conservation challenges.