Question

What Mediterranean landmark is on Spain's southern border?

Answer 1

It's the rock of Gibraltar

Answer 2

Right answer: The Strait of Gibraltar (The Rock of Gibraltar)

The Strait of Gibraltar is located on the southern border of Spain with the northern part of Africa. It is the place where the natural union of two masses of water occurs: the Mediterranean Sea and the Atlantic Ocean, it is also the separation between two continents: Europe and Africa.  

This place is very striking among several things, by the existence of a large Rock, the Rock of Gibraltar

It is currently a British colony, although there is a dispute between Spain and the United Kingdom over this iconic territory.