Ezekiel 47:18

And the east side ye shall measure from Hauran, and from Damascus, and from Gilead, and from the land of Israel by Jordan, from the border unto the east sea. And this is the east side.

The east side is measured as reaching unto the east sea. From the house waters are seen issuing eastward. That eastward flow means the work begins as a small, very small rivulet and then extends to the east and to the west, to the islands of the sea and to all parts of the world. Therefore the work is not to be centered or consolidated in any one place, but each institution is to remain independent, working out God's plan under His direction.