From AMS Glossary
One of the western boundary currents of the Atlantic Ocean and part of the pathway for water from the southern into the Northern Hemisphere in the global ocean conveyor belt.
Flowing northward along the northern coast of South America, it originates from the North Brazil Current, receives a contribution from the South Equatorial Current, and continues as the Caribbean Current. The continuity of the Guyana Current as a permanent northward current is in doubt, but northward flow does exist in the mean. Eddies related to flow instability typical for western boundary currents have been reported.