The Mediterranean landmark on Spain’s southern border is the Strait of Gibraltar.
Explanation:
The Mediterranean landmark on Spain’s southern border is the Strait of Gibraltar. The Strait of Gibraltar, named “Estrecho de Gibraltar” in Spanish, is a strait that connects the Atlantic Ocean with the Mediterranean Sea and is what separates Spain from Morocco, that is to say, it separates Europe from Africa. Gibraltar is actually a British Territory but it's located in the Iberian Peninsula.
