Colinas y Lomas Submarinas del Pacífico Norte

Colinas y Lomas Submarinas del Pacífico Norte is a vast marine Integrated Management District located in the extreme northern reaches of Colombia's Pacific maritime territory off the coast of Chocó department. Declared in June 2022 through Resolution 0671, this oceanic protected area covers approximately 2,761,116 hectares of deep-sea habitat characterized by submarine hills, ridges, seamounts, and ocean trenches reaching depths of 4,800 meters. The district forms part of the Tropical Eastern Pacific Marine Corridor (CMAR), one of the world's most biologically significant ocean regions, and represents Colombia's commitment to the global 30x30 conservation target. Research expeditions have documented at least 380 benthic and pelagic species within the area, including three species potentially new to science.

The district's waters support an extraordinary diversity of marine life spanning the water column from the surface to abyssal depths. Large pelagic species including yellowfin tuna, dorado, sailfish, blue marlin, wahoo, and various shark species migrate through these waters, drawn by the productive upwelling zones created by the submarine topography. Sea turtles, marine mammals including humpback whales during their annual migration, and diverse seabird populations utilize the area as critical habitat along transoceanic migration routes. Deep-sea research has revealed rich benthic communities on the seamounts and submarine ridges, with indicator species of vulnerable marine ecosystems including cold-water corals, sponge gardens, and specialized invertebrate assemblages adapted to the extreme pressures and darkness of the bathyal zone.

As a predominantly deep-ocean protected area, the district's photosynthetic communities are concentrated in the upper water column and shallower submarine features where sunlight penetrates. Phytoplankton assemblages form the base of the marine food web, with seasonal blooms driven by nutrient upwelling around the seamounts and submarine ridges supporting the entire pelagic ecosystem. In areas closer to the continental shelf edge, seagrass communities including genera such as Syringodium and Thalassia provide important nursery habitat for fish and invertebrates. The deeper zones support chemosynthetic microbial communities around hydrothermal features, while the seamount slopes host diverse macroalgae and encrusting organisms that create structural habitat for other marine life.

The district encompasses a complex submarine landscape shaped by tectonic activity along the boundary of the Nazca and Caribbean plates in the eastern Pacific basin. The seafloor topography features extensive fields of submarine hills and ridges, the Sandra mountain range, portions of the Colombia Trench, isolated seamounts, and deep depressions that collectively create one of the most geomorphologically diverse underwater landscapes in the eastern Pacific. Seamounts rising from the abyssal plain create localized ecosystems where ocean currents deflect upward, bringing nutrient-rich deep water toward the surface and generating biological hotspots. The geological substrate ranges from volcanic basalt on the seamounts to fine sedimentary deposits in the trench systems, each supporting distinct biological communities adapted to the specific conditions.

The surface waters above the district are influenced by the equatorial Pacific climate system, with warm sea surface temperatures typically ranging between 26 and 29 degrees Celsius year-round. The region experiences two main seasons driven by the Intertropical Convergence Zone: a wetter period from May through November when southeast trade winds strengthen and a relatively drier period from December through April. Ocean currents including the Colombia Current and the Equatorial Counter Current create complex circulation patterns that influence water temperature, salinity, and nutrient distribution throughout the district. El Niño and La Niña events periodically alter these patterns, affecting marine productivity, species distribution, and the intensity of upwelling around the seamounts.

The Pacific coast of Chocó adjacent to the district has been home to indigenous communities including the Emberá and Wounaan peoples for centuries, who have traditionally relied on coastal and near-shore fishing as a fundamental part of their culture and subsistence. Afro-Colombian communities, descendants of enslaved Africans who arrived during the colonial period, have also developed deep connections to the Pacific waters through artisanal fishing traditions passed down through generations. Industrial fishing activity in the broader eastern Pacific expanded significantly during the twentieth century, with tuna fleets and longline vessels operating in waters that now fall within the district's boundaries. The recognition of these waters' biological importance grew through scientific expeditions that revealed the extraordinary deep-sea biodiversity hidden beneath the surface.

The Distrito Nacional de Manejo Integrado Colinas y Lomas Submarinas de la Cuenca Pacífico Norte was formally declared on June 28, 2022, through Resolution 0671 issued by Colombia's Ministry of Environment and Sustainable Development. The declaration was part of Colombia's strategy to expand marine protected areas and contribute to the international 30x30 target of protecting 30 percent of the world's oceans by 2030. Scientific research conducted by INVEMAR (Colombia's Institute for Marine and Coastal Research) and Parques Nacionales Naturales provided the biological and geological evidence supporting the area's designation, including the discovery of species potentially new to science. The district is managed under Colombia's national protected areas system with a governance model that balances conservation with sustainable use of marine resources.

As an oceanic deep-sea protected area located at an average distance of 81.5 kilometers from the coast, the district is not accessible for conventional tourism or recreational activities. The primary attractions are scientific in nature, with research expeditions using remotely operated vehicles and deep-sea sampling equipment to explore the submarine hills, seamounts, and trenches that give the area its name. National Geographic has documented Colombia's marine protected areas including this district, bringing global attention to the extraordinary deep-sea ecosystems hidden beneath the Pacific surface. For those interested in the broader marine ecosystem, the adjacent Chocó coastline between the Orpúa River and El Almejal Beach near Bahía Solano offers opportunities to experience the surface expressions of this biologically rich ocean region, including whale watching during the humpback migration season.

The district is an entirely oceanic protected area with no visitor infrastructure, as its remote deep-sea location and conservation objectives are not oriented toward public access or recreational use. The nearest coastal access points are along the Chocó Pacific coast, with Bahía Solano and Nuquí serving as the primary gateway communities reachable by air from Medellín or Bogotá or by sea from Buenaventura. These coastal towns offer ecotourism experiences related to the broader Pacific marine ecosystem, including whale watching, diving, and visits to nearby terrestrial protected areas. Scientific research expeditions to the district are coordinated through INVEMAR and Parques Nacionales Naturales de Colombia, requiring specialized vessels and deep-sea research equipment.

The district's conservation framework operates under an integrated management model that seeks to balance biodiversity protection with sustainable use of marine resources, particularly supporting food sovereignty through responsible fishing practices. Key conservation objectives include protecting the geodiversity and biodiversity of the submarine landscapes, understanding the ecological functions of seamount and trench ecosystems, and managing transzonal and migratory species populations sustainably. The designation addresses threats from industrial overfishing, illegal unreported and unregulated fishing, deep-sea mining interests, and the broader impacts of climate change including ocean acidification and warming that affect deep-sea communities. Colombia's participation in the Tropical Eastern Pacific Marine Corridor (CMAR) provides a regional framework for coordinating conservation efforts with neighboring countries including Panama, Costa Rica, and Ecuador.