The Bay of Gibraltar, is a bay at the southern end of the Iberian Peninsula. It is around 10 km (6.2 mi) long by 8 km (5.0 mi) wide, covering an area of some 75 km2 (29 sq mi), with a depth of up to 400 m (1,300 ft) in the centre of the bay. It opens to the south into the Strait of Gibraltar and the Mediterranean Sea.

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.