The Platanillo block is situated in the Putumayo basin in southwest Colombia near the Ecuadorian border. The field was originally discovered by Ecopetrol in 1988 but field development did not occur until 2006. In 2014, Amerisur was granted an expansion to the original license to include the southern portion of the field up to the border with Ecuador. The Caguan-Putumayo basin, which lies in southern Colombia between the Eastern Cordillera of the Andes and the Guyana-Brazilian shield, is considered to be the northern extension of the Oriente basin of Ecuador. The northern part of the area is considered the Caguan while the southern area, including the border area with Ecuador, is considered the Putumayo basin.