Following are a number of back-translations as well as a sample translation for translators of Jeremiah 49:21:

• Kupsabiny: “Those people will crash to the ground
  to make the land tremble
  and (they) will throw out loud cries
  to be heard at the Red Sea.” (Source: Kupsabiny Back Translation)
• Hiligaynon: “At the terrible destruction of Edom the ground will-shake, and their weeping can-be-heard until the Red Sea.” (Source: Hiligaynon Back Translation)
• English: “When Edom is destroyed, the noise will be extremely great,
  with the result that the earth will shake,
  and the wailing of the people will be heard as far away as the Red Sea.” (Source: Translation for Translators)