Mona Passage

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Mona Passage is a strait in the Caribbean Sea separating the islands of Puerto Rico and the Dominican Republic and serving as a marine corridor between the Atlantic Ocean and the Caribbean Sea. The passage lies near the Mona Island archipelago and is bounded by notable landforms including Añasco Bay, Cabo Rojo, and Pedernales Province. Its strategic position links major maritime routes used by vessels traveling among Miami, San Juan, Port-au-Prince, Santo Domingo, and transatlantic shipping lanes.

Geography

The passage stretches roughly from the vicinity of Rincón and Aguadilla southward toward Bayahibe and Punta Cana in Dominican Republic waters, flanked by features such as Mona Island, Caja de Muertos, and the Desecheo Island complex. Bathymetric transitions border the Puerto Rican Shelf and the Hispaniola Trench system, creating a corridor used by coastal ferries linking Mayagüez and Santo Domingo. The passage’s proximity to Vieques and Culebra influences local navigation routes to Guantánamo Bay and international ports such as Kingston and Havana.

Geologically the area lies within the Greater Antilles island arc and is influenced by tectonics associated with the North American Plate and the Caribbean Plate. Submarine features include submarine canyons and escarpments adjacent to the Muertos Trough and the Swan Islands Transform Fault. Seismicity related to events like historical earthquakes and modern swarms has been recorded by observatories such as the Puerto Rico Seismic Network. Oceanographic surveys by institutions including the United States Geological Survey and the Smithsonian Tropical Research Institute document complex bathymetry with steep slopes feeding into abyssal basins studied alongside projects involving the National Oceanic and Atmospheric Administration and the Woods Hole Oceanographic Institution.

The passage experiences tropical maritime climate influences from systems such as the North Atlantic Oscillation and seasonal effects of the Intertropical Convergence Zone. Surface currents include branches of the Antilles Current and the Caribbean Current, with exchanges to the Gulf Stream system affecting temperature and salinity patterns monitored by NOAA buoys and the Scripps Institution of Oceanography. Tropical cyclones including storms from the Atlantic hurricane season and historic events like Hurricane Maria and Hurricane Irma alter seasonal circulation and storm surge patterns, impacting coastal communities like Mayagüez and Barahona.

The Passage supports ecosystems documented by research programs at University of Puerto Rico and the Caribbean Coral Reef Institute. Coral communities include taxa studied alongside reef frameworks in Buck Island Reef National Monument and the Mona and Monito Islands Nature Reserve, with species recorded by the International Union for Conservation of Nature inventories. Pelagic fauna such as Atlantic bluefin tuna, yellowfin tuna, sailfish, mako shark, and cetaceans including humpback whale migration corridors intersect regional waters monitored by the International Whaling Commission and regional NGOs like SEAZ, with tagging studies run by institutions such as the NOAA Fisheries and the Oregon State University fisheries program. Seagrass beds and mangrove-associated fisheries support populations of commercially important species exploited by ports like Mayagüez and Santo Domingo and managed under regional agreements including the Cartagena Convention.

Human use dates to pre-Columbian navigation by Taíno communities recorded in archeological work by universities such as the Institute of Puerto Rican Culture. European contact involved expeditions associated with figures like Christopher Columbus and colonial ports including San Juan and Santo Domingo, with maritime history studied by the National Park Service and museums such as the Museo de las Americas. Navigation lanes have been used by merchant fleets of nations including Spain, United Kingdom, France, and United States of America, and by modern ferry operators linking Mayagüez and Santo Domingo. Charting and hydrographic surveys have been conducted by the United Kingdom Hydrographic Office and the National Geospatial-Intelligence Agency.

The passage is economically significant for commercial shipping, fisheries, and tourism, connecting cargo flows to ports like San Juan, Santo Domingo, Port of Miami, and transshipment hubs such as Freeport. Fisheries exploited by coastal communities supply markets in territories administered by entities including the Government of Puerto Rico and the Dominican Republic Ministry of Tourism. Strategically, the corridor lies within areas of interest for navies including the United States Navy and coast guards such as the United States Coast Guard and the Dominican Navy for operations related to migration interdiction, maritime security, and disaster relief coordinated with agencies like Federal Emergency Management Agency and regional security efforts by the Organization of American States.

Navigational hazards include strong tidal flows, submerged rocks near Mona Island and Desecheo Island, and rip currents documented by the United States Lifesaving Association. Historical and recent incidents involve ship groundings and search-and-rescue operations coordinated by the United States Coast Guard and the Dominican Civil Aviation and Meteorology Institute for aircraft overflights. Notable maritime disasters in the broader region have involved liners and cargo ships flagged under registries such as Panama and Liberia, prompting investigations by bodies like the International Maritime Organization and regional courts. Environmental hazards from oil spills and invasive species have engaged response teams from entities such as NOAA and the Environmental Protection Agency in binational cooperation.