Gibraltar is a British Overseas Territory located at the southern tip of the Iberian Peninsula. It has an area of 6.7 km2 (2.6 sq mi) and is bordered to the north by Spain. In 1704, Britain captured Gibraltar from Spain during the War of the Spanish Succession on behalf of the Habsburg claim to the Spanish throne. The territory was ceded to Great Britain in perpetuity under the Treaty of Utrecht in 1713.

Gibraltar is one of the most densely populated territories in the world, with a usually-resident population in 2024 of 33,714, equivalent to approximately 12,950/sq mi). 

Source: UN World Population Prospects report