Sentence:  [H]eld safe and sound, I'd find the South Equatorial at last, at last, and safe from all the <WSD>Sargassoes</WSD>, the Scillas and Charibs, I'd swoop beautifully and lightly, drifting with the sweet currents of the South down the edge of the Brazilian Highlands to the Waters of Peace. 
Meaning of the word marked with <WSD> tags:  A part of an ocean or sea characterized by floating masses of sargassos, like the Sargasso Sea.