Is it a proper noun? Yes, it is.
"Mediterranean Sea" is capitalised, but "border" would not be.
Yes, because is it the title of a specific sea.
The Mediterranean Sea is a proper noun, the name of a specific body of water. A proper noun is always capitalized.
That is the correct spelling of "turkey" (a large bird). The capitalized form "Turkey" is the name of the country between the Mediterranean Sea and the Black Sea.
They are all wrong, these words should be capitalized. But the correct spelling for the sea is Mediterranean.
The Mediterranean Sea.
The Mediterranean Sea is larger than the North Sea. The Mediterranean is approximately 2,500,000 square kilometers (970,000 square miles) while the North Sea is approximately 750,000 square kilometers (290,000 square miles).
Mediterranean Sea
The Mediterranean Sea. They referred to it as either "our lake" or "our sea".The Mediterranean Sea. They referred to it as either "our lake" or "our sea".The Mediterranean Sea. They referred to it as either "our lake" or "our sea".The Mediterranean Sea. They referred to it as either "our lake" or "our sea".The Mediterranean Sea. They referred to it as either "our lake" or "our sea".The Mediterranean Sea. They referred to it as either "our lake" or "our sea".The Mediterranean Sea. They referred to it as either "our lake" or "our sea".The Mediterranean Sea. They referred to it as either "our lake" or "our sea".The Mediterranean Sea. They referred to it as either "our lake" or "our sea".
The Cyprus island is located in the eastern part of the Mediterranean Sea.
Suez connects the Mediterranean & the Red Sea.
The Nile River empties into the Mediterranean Sea.