* Hyperbole: The statement that "all seas gang dry" is an exaggeration, highlighting the speaker's intense and enduring love. Seas cannot literally dry up, making it a hyperbole.
* Metaphor: "Seas gang dry" can be interpreted as a metaphor for the end of time or the end of everything. The speaker is suggesting that their love will last as long as the world itself.
* Personification: "Seas gang dry" personifies the sea, giving it the ability to "gang dry" (become empty). This further emphasizes the enduring nature of the speaker's love.
* Alliteration: The repetition of the "s" sound in "seas gang dry" creates a sense of rhythm and emphasis.
Overall, these devices create a powerful and evocative statement about the enduring nature of love.