Algeciras is a municipality of Spain belonging to the province of Cádiz, Andalusia. Located in the southern end of the Iberian Peninsula, near the Strait of Gibraltar, it is the largest city on the Bay of Gibraltar. The Port of Algeciras is one of the largest ports in Europe and the world in three categories: container, cargo and transshipment. The urban area straddles the small Río de la Miel, which is the southernmost river of continental Europe. As of 1 January 2020, the municipality had a registered population of 123,078. It forms part of the comarca of Campo de Gibraltar.
The surrounding metro area also includes the municipalities of Los Barrios, La Línea de la Concepción, Castellar de la Frontera, Jimena de la Frontera, San Roque and Tarifa, with a population of 263,739.