Naufragare means "to be shipwrecked" or "to be lost at sea." It is a dramatic, poetic verb that paints the vivid image of a ship breaking apart against the waves, far more evocative than a plain "to fail" or "to sink."
In the song, "Parli di mare, di naufragare" ("You talk of the sea, of being shipwrecked") uses the verb metaphorically, comparing being overwhelmed by love or life to drowning in open water.
In "Poesia," Sal Da Vinci isn't just singing a love song; he's describing a woman who is poetry itself. He sees her as "Così poetica anche nell'errore" (So poetic even in her mistakes). She speaks in grand terms of the sea and love, and she's an endless source of inspiration, described as "benzina per artisti e romantici" (fuel for artists and romantics). She has a way of using "metafore che sembrano immagini" (metaphors that seem like images), making her words come alive.
For the singer, this woman is a constant truth in a fast-moving world. While everything else passes, "Tu rimani pe' l'eternità" (You remain for eternity). The main idea is repeated in the chorus: "Sì, tu sei poesia / Che non ha bisogno di melodia" (Yes, you are poetry / That doesn't need a melody). She is a complete work of art on her own, living somewhere between "bellezza e follia" (beauty and madness).