Jamieson, Fausset and Brown on Isaiah 23:10

10. a river--Hebrew, "the river," namely, Nile.

daughter of Tarshish--Tyre and its inhabitants (Is 1:8), about henceforth, owing to the ruin of Tyre, to become inhabitants of its colony, Tartessus: they would pour forth from Tyre, as waters flow on when the barriers are removed [Lowth]. Rather, Tarshish, or Tartessus and its inhabitants, as the phrase usually means: they had been kept in hard bondage, working in silver and lead mines near Tarshish, by the parent city (Eze 26:17): but now "the bond of restraint" (for so "strength," Margin, "girdle," that is, bond, Psa 2:3, ought to be translated) is removed, since Tyre is no more.