Article: Avifauna of the Pongos Basin, Amazonas Department, Peru.(Report)

A distinctive feature of the Peruvian Andes is the frequent presence of 'pongos', or water gaps, which are transverse openings in mountain ridges caused by tectonic activity. In some instances, rivers cut through sufficiently high uplifted areas to create valleys of considerable amplitude. The highest concentration of pongos in Peru is in northern Amazonas Department (Fig. 1), an area that geologists have aptly named the 'Pongos Basin' (Cobbing et al. 1981). The basin consists of a system of mesic valleys separated by relatively low ridgelines; the valleys are drained by north-south and south-north flowing rivers that enter the Maranon River as it flows toward the ...

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