Folklore usually places Gog and Magog in Central Asia... beyond the “Iron Gate” mountain pass in Uzbehkistan. But the Turks originally did come from the area beyond those mountains.
There are some other interpretations that indicate they were in Turkey because they were descendants of Jepheth who settled in Europe vs Seth who settled in Asia.
I’ve seen the other theories that Magog is potentially Russia, Assyria/Babylon/Iran, Scythians, or even Mongolia/China - Beyond the Gates of Alexander; but most of those don’t tie anything back to Jepheth which I found to be a gap given Magog is noted to be Jepheth’s son in Genesis 10.