'Middle' in the Bible

Then all the officials of the king of Babylon came in and sat down at the Middle Gate: Nergal-sar-ezer, Samgar-nebu, Sar-sekim the Rab-saris, Nergal-sar-ezer the Rab-mag, and all the rest of the officials of the king of Babylon.

And as soon as you finish reading this scroll, you will tie a stone to it and throw it into the middle of the Euphrates,