Cauca y Valle del Cauca, en el suroeste y Arauca en el noreste.

BBC: Mundo | Am��rica Latina | Colombia: rev��s para Uribe

Guerrillas are active in the Colombian provinces of Arauca and Norte de Santander.

ECONOMIST: Venezuela

Oil has become a problem for indigenous communities such as the U'Wa, who live in the eastern provinces of Arauca, Casanare, Santander, Norte de Santander and Boyaca.

BBC: Colombia's indigenous peoples face uncertain future