Yes, "Mediterranean Sea" should be capitalized because it is the name of a specific body of water.
Germany has no border with the Mediterranean
YES. The entire northwest border of Israel is the Mediterranean Sea.
Russia does not border onto the Mediterranean
These north African counties boarder the Mediterranean Sea
The Mediterranean Sea
The Mediterranean Sea does.
Malta is surrounded by the Mediterranean Sea
The Mediterranean Sea.
Mediterranean Sea
Lebanon lies on the eastern shore of the Mediterranean Sea.
The Mediterranean Sea