The Chuquisaca and Tarija regions of Bolivia cover areas of extraordinarily varied vegetation, providing one of the most dramatic shifts in flora and vegetation along the eastern Andes. However, biological information for this area has remained very limited. This text is the result of the work of an interdisciplinary team of biologists who surveyed south-central Chuquisaca in May 1995. It describes the large uninterrupted tracts of Bosque-Tucuman-Boliviano wet forest with many endemic species, but reports that the area also suffers from heavy development pressures.