Caribbean Sea is the correct way to spell it, as you have it in the question.
Caspian Sea .
Mar a mar.
The correct spelling is the 'Caribbean Sea'
sea-side
see
The sea "snail".
I think you want the words "sea anemone".
The plural form of the noun 'sea' is seas.
The name of the sea between Europe and Africa is the Mediterranean Sea.
hippocampe
Anemone is the sea creature.