Well, Strait of Gibraltar is the waterway connecting the Western end of the Mediterranean Sea to the Atlantic Ocean. Europe is North and Africa is South of the Strait.
In the Strait of Gibraltar, you will find water. Lots and lots of water. :D
It was caused naturally 5.3 million years ago maybe due to the movement of the African Plate
There are at least 3 ferry lines from Spain to Oran Algeria. There are others from France to Algeria. See Related Link.
The Strait of Gibraltar it is still very important to the ocean-going aquatic mammals that migrate through it twice each year.