A/HRC/4/32/Add.2 page 3 The gradual destruction of the indigenous habitat and the impact of extractive activities on the environment and the rights of indigenous peoples, mainly in the areas around the Amazon, the northern border and the Pacific coast, have raised great concern. The situation of uncontacted or voluntarily isolated populations merits special attention, as they are adversely affected by the illegal felling of trees and other illicit activities in their territories. Oil exploration activities on indigenous lands have likewise triggered resistance in some communities, as in the case of the Sarayaku people in the Amazon region, who have sought protection through the inter-American human rights system. On the northern border with Colombia, concern has been voiced about the effects on the health of indigenous peoples of the aerial spraying of illicit crops and other acts originating from the internal conflict in Colombia.