You see you right, almost about the location. But you don't realize one thing about it. The Khazars who converted to Judism and became the Ashkenazi Jews who make up 95 percent of the Jews today. They sat in the lands of Gog and Magog and latter after holding out against the Monguls where finally pushed north by the Muslims into the lands of Poland, Germany and Russia later to flee to the United States and what is now Israel. 5 million in Israel and 6 million in the United States. This is how these Jews are Gog and Magog.

This is from Jewish sources.

Jewish sources
A letter in Hebrew dated AM 4746 (985–986) refers to "our lord David, the Khazar prince" who lived in Taman. The letter said that this David was visited by envoys from Kievan Rus to ask about religious matters — this could be connected to the Vladimir conversion which took place during the same time period. Taman was a principality of Kievan Rus around 988, so this successor state (if that is what it was) may have been conquered altogether. The authenticity of this letter, the Mandgelis Document, has however been questioned by such scholars as D. M. Dunlop.

Abraham ibn Daud, a twelfth-century Spanish rabbi, reported meeting Khazar rabbinical students in Toledo, and that they informed him that the "remnant of them is of the rabbinic faith." This reference indicates that some Khazars maintained ethnic, if not political, autonomy at least two centuries after the sack of Atil.

Petachiah of Ratisbon, a thirteenth-century rabbi and traveler, reported traveling through "Khazaria", though he gave few details of its inhabitants except to say that they lived amidst desolation in perpetual mourning.

He further related:

Whilst at Baghdad saw ambassadors from the kings of Meshech, for Magog (medieval Christian writers said that the Khazars lived in the land of Gog and Magog) is about ten days' journey from thence. The land extends as far as the Mountains of Darkness (a term often used to describe the Caucasus). Beyond the Mountains of Darkness are the sons of Jonadab, son of Rechab (an official in the court of King Josiah of Judah). To the seven kings of Meshech an angel appeared in a dream, bidding them to give up the laws and statutes, and to embrace the laws of Moses, son of Amram. If not, he threatened to lay waste their country. However, they delayed until the angel commenced to lay waste their country, when the kings of Meshech and all the inhabitants of their countries became proselytes, and they sent to the head of the academy (i.e., the Gaon of Sura or Pumbedita) a request to send them some disciples of the wise. Every disciple that is poor goes there to teach them the law and Babylonian Talmud. From the land of Egypt the disciples go there to study. He saw the ambassadors visit the grave of [the prophet] Ezekiel…"
The account of the conversion of the "seven kings of Meshech" is extremely similar to the accounts of the Khazar conversion given in the Kuzari, and in King Joseph's Reply. It is possible that Meshech refers to the Khazars, or to some Judaized polity influenced by them. Arguments against this possibility include the reference to "seven kings" (though this, in turn, could refer to seven successor tribes or state micropolities).