Among the five oceans of the world, you would find the Mediterranean Sea and the Caspian Sea, with the former covering twice the area of the latter. While these two seas are often associated as one due to their location, nothing can be further from the truth. Separated geographically by more than a thousand miles, the two seas have their own set of features which make them very different from one another.
For starters, the Caspian Sea is a closed body of salt water while the Mediterranean is an open ocean basin. This means the Caspian Sea can never hold any new water as it is an enclosed lake, in contrast to the Mediterranean which receives water from other sea bodies by way of movement and evaporation. Additionally, the surface level of the Caspian is at 28 metres while the Mediterranean is at approximately 340 metres.
The water composition in the two seas is vastly different. The Caspian has a larger concentration of hydrocarbon materials and the water is widely polluted by way of industrial activities. On the other hand, the Mediterranean holds significantly less salt than the warmer, brackish water of the Caspian; however, the level of acidity is significantly higher and certain
