The Limón Dam, part of the Olmos Transandino Project, is an under construction multi-purpose concrete-face rock-fill embankment dam on the Huancabamba River in northwestern Peru, located to the south of Guabal. When completed, the project will help produce of electricity per year and transfer water from the Cajamarca region west to Lambayeque, near Olmos for the reclamation and irrigation of of farmland. The greatest feature and engineering challenge of the project was digging the trans-Andean tunnel as it connects the Atlantic side of the Andes (Amazon Basin) with the Pacific side.