Yucatán Channel

Lore & Background

The Yucatán Channel separates Cuba from the Yucatán Peninsula of Mexico and links the Caribbean Sea with the Gulf of Mexico. The strait is 217 kilometres (135 mi) across between Cape Catoche in Mexico and Cape San Antonio in Cuba. It has a maximum depth near the Cuban coast of 2,779 metres (9,117 ft). Water flows through the Caribbean Sea from east to west, consisting of 5 Sv from the North Equatorial Current through the Windward Passage and 12 Sv from the South Equatorial Current along the coast of Brazil, totaling about 17 Sv at a temperature of at least 17 °C. This flow becomes the Yucatán Current, providing most of the inflow of water into the Gulf of Mexico. The Yucatán Current flows strongly on the western side of the channel, while the Cuban Countercurrent flows in the opposite direction on the easterly side. Underneath the Yucatán Current, a southward-flowing Yucatán Undercurrent takes water away from the Gulf of Mexico.

As water passes through the channel into the Gulf of Mexico, it goes over the Campeche Bank, a shallow area with coral reefs on the outer fringes of the Yucatán shelf about 100 kilometres (62 mi) offshore. The main reef-building corals here are Acropora cervicornis, Acropora palmata, and Montastraea annularis. In the late 1990s many of these died, though some recolonisation has since taken place. The Campeche Bank is a biodiverse area heavily fished by artisan fishermen from along the coast of Mexico, and the area is threatened by overexploitation.

Reader's Guide

The Yucatán Channel is a vital geographical feature that connects the Caribbean Sea and the Gulf of Mexico, influencing ocean currents and marine ecosystems. Its width of 217 kilometers and depth of nearly 2,800 meters facilitate the flow of warm water—about 17 sverdrups—that drives the Yucatán Current, which is the primary source of water entering the Gulf of Mexico. This current, along with the opposing Cuban Countercurrent and the deep Yucatán Undercurrent, shapes regional oceanography and climate. The channel also supports biodiverse coral reefs on the Campeche Bank, which are key habitats for species like Acropora cervicornis and Montastraea annularis. However, these reefs suffered die-offs in the late 1990s, and the area faces threats from overfishing by artisan fishermen. The channel's role in water exchange and its ecological significance make it a critical subject for oceanographic and conservation studies.

Did You Know?

• The Yucatán Channel is just over 200 kilometres (120 mi) wide and nearly 2,800 metres (9,200 ft) deep at its deepest point near the coast of Cuba.
• Water flow through the channel totals about 17 Sv, consisting of 5 Sv from the North Equatorial Current and 12 Sv from the South Equatorial Current.
• The Yucatán Current flows strongly on the western side of the channel, while the Cuban Countercurrent flows in the opposite direction on the easterly side.
• Coral reefs on the Campeche Bank include Acropora cervicornis, Acropora palmata, and Montastraea annularis, many of which died in the late 1990s.