The Magdalena River is the principal river of Colombia, flowing northward about through the western half of the country. It takes its name from the biblical figure Mary Magdalene. It is navigable through much of its lower reaches, in spite of the shifting sand bars at the mouth of its delta, as far as Honda, at the downstream base of its rapids. It flows through the Magdalena River Valley. Its drainage basin covers a surface of, which is 24% of the country's area and where 66% of its population lives.
The Magdalena River basin, which includes the Cauca River and other tributaries, is very rich in fish., 213 fish species were known from the basin. Since then several new species have been described from the basin such as five Hemibrycon in 2013, two Ancistrus in 2013 and a Farlowella in 2014. Among the more famous species in the basin are Kronoheros umbriferus, Ctenolucius hujeta, Geophagus steindachneri, Ichthyoelephas longirostris, Panaque cochliodon, Pimelodus blochii, Potamotrygon magdalenae, Prochilodus magdalenae, Pseudoplatystoma magdaleniatum and Salminus affinis. About 55% of the fish species in the basin are endemic, including four endemic genera: The catfish Centrochir and Eremophilus, and the characidsCarlastyanax and Genycharax. In general, the fish fauna shows connections with surrounding basins, notably Atrato and Maracaibo, but to a lesser extent also Amazon–Orinoco. The most productive fishing areas in Colombia are in the basin, but there has been a drastic decrease in the annual harvest with a fall of about 90% between 1975 and 2008. The primary threats are pollution and habitat loss. Additional dams are being constructed, including El Quimbo and Ituango, which has caused some controversy. As a result of the pollution, heavy metals have also been detected in some commercially important fish in the river., 19 fish species in the river basin were recognized as threatened.
Due to its geographical position in the north of South America, the Magdalena River was since precolumbian times a route towards the interior of today Colombia and Ecuador. Several Carib speaking peoples such as the Panche and the Yariguí ascended through the western bank of the river, while its eastern portion was inhabited by the Muisca civilization, which called the river Yuma. Likewise, the Spanish conquistadores who arrived to today's Colombia early in the 16th century used the river to push to the wild and mountainous inland after Rodrigo de Bastidas discovered and named the river on April 1, 1501. During the Spanish colonization of the Americas, the river was the only transport link communicating Bogotá with the Caribbean Sea portCartagena de Indias and thus with Europe. In 1825, the Congress of Colombia awarded a concession to establish steam navigation in the Magdalena River to Juan Bernardo Elbers, but his company closed shortly after. By 1845, steamboats regularly travelled on the river until 1961, when the last steamers ceased operation.
Much of the film Love in the Time of Cholera takes place in the historic, walled city of Cartagena in Colombia. Some screen shots showed the Magdalena River and the Sierra Nevada de Santa Marta mountain range. The General in His Labyrinth, by Gabriel García Márquez, is a fictionalized account of the final voyage of Simón Bolívar down the Magdalena River, where he revisits many cities and villages along the river.