The site is part of the CZO BVET - Observatory for Research in Environment-Experimental Tropical Watersheds (http://bvet.obs-mip.fr), funded by the French Research Institute for the Development (IRD) and the INSU. The site is monitored by personels from the Indo-French Cell for Water Sciences (IFCWS) in the Indian Institute of Science (IISc). It aims to understand and quantify the effect of the environmental parameters on the hydrological and geochemical cycles in southern India, and more particularly in the Kabini River watershed (7000 km2). The site is located in the Karnataka state presents in its south-eastern part a unique context to carry out comparative studies on the effect of environmental parameters. The Ghâts range, stretching parallel to the west coast of the peninsula, form an orographic barrier: from west to east indeed the annual rainfall decreases progressively within a distance of about 50 km from high values (between 2000 mm and 6600 mm/yr) to only 500 mm/yr. The transition area corresponds to a narrow strip of forest protected from human activities: the Bandipur National Park. The Kabini River drainage basin contains the three climatic areas and is a unique laboratory for studying the physical and chemical erosion fluxes with respect to the soil cover and the hydroclimatic conditions. In order to identify the major reservoirs regulating the cycles and to quantify the fluxes between these reservoirs, two small experimental watersheds (SEW) have been delineated in the Bandipur National Park. The two SEWs are Maddur (cultivated; 7.1 km2) and Mule Hole (forested; 4.3 km2). Both are equipped with different devices (borewells, piezometers, pluviometers, gauging stations, rain samplers…) and sensors (weather station, tensionics,…) to allow the monitoring of data.