Consider the following statements about Strait of Gibraltar 

1. It is a narrow channel that divides Europe and Africa while serving as the sole natural maritime link between the Atlantic Ocean and the Mediterranean Sea.

2. Due to differing salinity levels, the denser waters of the Mediterranean flow outward beneath the incoming lighter waters from the Atlantic.

3. The Moroccan port of Tanger-Med, situated on its shores, is one of the region’s key logistical hubs.

How many of the above statements are correct?