Block 67 is located in the Marañon basin, which produces most of Peru's oil. The basin is also productive in Ecuador (Oriente) and in Colombia (Putumayo). The basin is late Tertiary sub-Andean foreland and contains large Tertiary anticlines, most of which are non-hydrocarbon bearing. The block contains three oil fields: Dorado, Piraña and Paiche. The government declared it a project of national importance in 2009. Its location in a remote and undeveloped area presents major challenges with respect to environmental and social issues and access to infrastructure.