The seven seas. < a particular sea>
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ShadokThe choice between the definite article (the) and the indefinite (a(n)) is the choice between 'essCan we say :
We were delighted with the view of a blue sea.
or do we have to say:
We were delighted with the view of the blue sea.
We swam in a cold sea.
We swam in the cold sea.
bar9onWe swam in a cold sea.< could be any sea>These interpretations seem to apply more to the countable reading of 'sea'. I think the OP was interested more in the uncountable reading.
We swam in the cold sea.< a particular sea>