Excerpt from New Species of Centrolenid Frogs From Northern PeruIn the Departamento San Martin, a complex series of ridges reaching elevations of more than 1000 m extend eastward and southward from the Cordillera Central of the Andes. These steep, rocky ridges support lower montane rainforest and cloud forest, whereas the intervening valleys, most of which are extensively cultivated, contain remnants of dry tropical forest. Many small streams cascade down these slopes, major drainage systems ¿ow south Rio Mayo) or east (e. G., Rio Cainarache) into the Rio Huallaga, which separates the Cordillera Central from the Cordillera Oriental. In northern Peru, the Cordillera Oriental terminates in a series of ridges with elevations of 1000 - 1200 m. The Rio Huallaga cuts a canyon through these front ranges between Shapaja and Chazuta, to the south of which is the northern end of the Cordillera Azul (fig.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.