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The bottom right insert presents the eastern forelands of the northern Andes in Colombia, the so-called Llanos Basin. The main map shows the topography, the fluvial system, the oil and gas seep occurrence, and the drilled well location. From AAPG Memoir 114: Petroleum Systems Analysis—Case Studies, [[http://store.aapg.org/detail.aspx?id=1285 Chapter 08]].