This map and summary describe the Antarctic Circumpolar Current (ACC), which is the most important current in the Southern Ocean and the only current that flows completely around the globe. The ACC, as it encircles the Antarctic continent, flows eastward through the southern portions of the Atlantic, Indian, and Pacific Oceans. Links are provided to summary text detailing velocity and hydrographic observations, plots such as average current speed, drifting buoy positions, sea surface temperature maps, and HYbrid Coordinate Ocean Model (HYCOM) simulations. References are also included.