These mountains' highlands, which cover much of Peru, have grassy valleys where llamas graze
In 
these areas of high grazing, successional species of grass and forbs grow back 
thick,... [DOC] [TLE] Western South America: Peru and Bolivia | Ecoregions | WWF [PAR] These grasslands are located in steep mountains with deep valleys, which ... 
Areas in northern Peru have deposits of glacial loess as deep as one meter.