Cordillera O·rien·tal 
(ôr′ē-ĕn-täl, ō′ryĕn-)
(ôr′ē-ĕn-täl, ō′ryĕn-) A discontinuous series of mountain ranges in the Andes lying to the east of the Cordillera Occidental and extending from western Bolivia to northern Colombia. Its highest elevation is Illimani, 6,439 m (21,125 ft), in the Cordillera Real of Bolivia.