This is the name of the province that was west of the Euphrates River. It was across the river from the city of Susa. See how you translated this in [Esra 4:10](./09.md). (See: [[rc://en/ta/man/translate/translate-names]])
This can be translated in active form, in which case you will need to make explicit who translated and read the letter to the king. AT: "I have had my servants translate and read the letter that you sent to me" (See: [[rc://en/ta/man/translate/figs-activepassive]])