The verse beaus a new section, and glides back into the original metaphor of the ship, as in Ezekiel 27:4-9. The ships of Tarshish are used generically for merchant-ships. The catalogue of the commerce ends with Ezekiel 27:24, and the more poetic imagery reappears.
It was, as centering in herself all that they brought to her that the merchant-city was very glorious in the midst of the waters. For sing of thee, read, the ships of Tarshish were thy caravans (Revised Version).
The word has also the sense of "wall," as in Jeremiah 5:10 and Job 24:11; and this, describing the ships as the "wooden wails" of Tyre, gives a tenable sense here.