Answer:
The symbolism is in the expression "In a kingdom by the sea"
Explanation:
Symbolism in literature is used as a figure of speech that uses a word, or an expression to represent a concept in a subjective way. We can give an example of symbolism in the stanza shown above, in the expression "In a kingdom by the sea".
That's because the speaker of the poem says that his beloved lived in an anonymous place, which he calls "kingdom by the sea". In literature, the sea is often used to represent the interior of the characters. In this case, when the speaker says Annabel Lee lives in kingdom by the sea and all she does is love him and be loved by him, it means that they were inside each other, because they lived for each other, without any concern.
