'Beyond the River' in the Bible

The king sent an answer to Rehum the chancellor, and Shimshai the scribe, and the rest of their companions that dwell in Samaria, and the other places beyond the river: Peace, and so forth.

And there have been mighty kings over Jerusalem, who have ruled over all beyond the river; and tribute, tax, and toll were paid to them.

Therefore Tatnai, governor beyond the river, Shethar-boznai, and your companions the Apharsachites, who are beyond the river, be ye far from thence:

Moreover, I give orders what ye shall do to these elders of the Jews, for the building of this house of God: that of the king's goods, of the tribute beyond the river, expenses be diligently given to these men, that they be not hindered.

And I, I Artaxerxes the king, do give orders to all the treasurers that are beyond the river, that whatever Ezra the priest and scribe of the law of the God of the heavens shall require of you, it be done diligently,

And thou, Ezra, after the wisdom of thy God, which is in thy hand, set magistrates and judges who may judge all the people that are beyond the river, all such as know the laws of thy God; and teach ye him that knows them not.