Following are a number of back-translations as well as a sample translation for translators of Isaiah 23:11:

• Kupsabiny: “God has raised his hand over the ocean
  and disturbed the countries.
  He said a word about the people of Canaan.
  He said that the cities of those people should be destroyed.” (Source: Kupsabiny Back Translation)
• Newari: “The LORD has spread his hand out over the sea.
  And [he] made the kingdoms right and left tremble.
  He ordered that the fortresses of Phoenicia be destroyed.” (Source: Newari Back Translation)
• Hiligaynon: “The LORD has-stretched-out his hand over the sea to destroy it, therefore the kingdoms are-trembling with fear. He commanded to destroy the strong thing-that-give-security/defense of Phoenicia/[Fenecia].” (Source: Hiligaynon Back Translation)
• English: “It is as though Yahweh stretched out his hand over the sea
  and shook the kingdoms of the earth.
  He commanded that in Phoenicia/Canaan
  all its fortresses must be destroyed.” (Source: Translation for Translators)