Gibraltar, located just south of the Iberian peninsula, is a territory of which West Europe country?

Gibraltar, located just south of the Iberian Peninsula, is a territory of the United Kingdom. This is because Gibraltar has been under British sovereignty since 1713, when it was ceded to Britain in the Treaty of Utrecht. Despite its proximity to Spain, Gibraltar remains a British Overseas Territory, governed by its own parliament and system but ultimately under the sovereignty of the United Kingdom.