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Range DescriptionThe range was delimited by Defler (2003, 1004) and Hernández-Camacho and Cooper (1976). Occurs to the north of the lower Río Guayabero, where it is scarce (Klein and Klein 1976). More common through the piedmont of the Uribe region (between La Macarena and the Cordillera Oriental and in the Serrania La Macarena). It extends north to the along the eastern slopes of the Cordillera Oriental to about 3,000 m. In Central Colombia, L. lugens extends from the upper Magdalena valley to at least southern Tolima, west of the of the Río Magdalena and historically at least to the southern part of the Department of Cesar, on the west side of the Cordillera. It is almost certainly extinct there today. There is an isolated enclave in the Serrania de San Lucas in south-eastern Bolivar and northern Antioquia at the northern end of the Central Cordillera. The San Lucas population, studied briefly by Kavanagh and Dresdale, 1975), may have been connected to the populations of the upper Magdalena valley when there was forest there. L. lugens meets L. lagothricha somewhere in the Department of Caquetá, but exactly where is not known.
Bodini and Pérez-Hernández (1987) reported that no woolly monkeys have been collected in Venezuela, but that they would expect L. lugens to occur in the Selva San Camilo. State of Apure (following the distribution proposed by Fooden  and Hernández-Camacho and Cooper ).