Where is the Wall situated?
A few thousand years ago, Dhul Qarnain went West and came to a murky water, where he found a people, for whom he set rules to guide them. Then he veered and set off towards the East and he came to where he could see the Sun rising, and found a shelter less people. He then went on a path between two mountains to the place of Gog and Magog (G&M). Today these events take major significance, as the world (maybe) edges towards the time of the Malhama (Armageddon). Hence, scholars trace Dhul Qarnain's movements, to get to know more about G&M.
The Quran has succinctly described how Dhul Qarnain, the two horned warrior, went to the shores of the Black Sea (murky water) and then moved east to the Caspian (rising of the Sun). Then he took a path which brought him between two mountains and a people oppressed by G&M. A great leader of humanity, he rescued these people by imprisoning G&M, behind a huge wall. Forever, through millennia G&M have been endeavouring to get out and one day they will succeed.
It is unusual, in this day of satellite imagery that a huge wall structure cannot be identified. Is there any area left which has not been explored on the earths surface? Remember, G&M are human descendants of Hazrat Nuh(as) and there is nothing supernatural about them. It is with this thought in mind, that scholars research this topic. Where is the Wall and G&M?
There are two historical figures who are better identified with Dhul Qarnain. Alexander and Cyrus. Alexander is supported by some, because at one time during his conquest, he built a big gate at Derbent, to ensure safety in The Caspian. However, not enough of his travels coincides with the Quran's description. Cyrus is closer to the description given and he traveled much in this region during his Central and West Asian conquests. The description and characteristics of the two horned one, also seem to favour the concept of Cyrus the wise king. Hence, many scholars believe Cyrus is Dhul Qarnain.
As Cyrus conquered, he moved North and ran into the area of the Caucasus. Passing between this mountain range, north of Tbilisi in Georgia, is the Darial Pass. It's wide enough and allows an approach to the region south of the mountains, from the plains in Russia. Today highways are providing access, but in Cyrus time, he came across G&M and it is here that he may have built the Wall in the pass. If you look at a photograph of Darial Gorge from 1872, you see that there is an ancient tall broken structure there. Furthermore, other photographs suggest a tall wall between two mountains, now absorbed by nature. So it would seem, that the Wall of Dhul Qarnain has been destroyed or overcome.
What about G&M? Our present eschatology indicates G&M will emerge during the time of Hazrat Isa(as). That obviously is in a time yet to happen. Could it be that our chronology is wrong and G&M are already out and about in this world? Would it not explain the chaos which is building up in the world today? A couple of possible proofs of this conclusion.
There is the famous event when the Prophet (saw) woke from a dream, red and worried. He said to his wife Zainab bint Jahsh (ra), today the G&M have driven a hole in the Wall. This happened 1400 years ago. What is the likelihood of the Wall not being destroyed by now?
There is another Hadith which recently has perturbed scholars. It states that when the last G&M is passing the Lake Tiberius (Sea of Galilee), he will say " when the first G&M passed by, this place was full of water. Now when I pass it, the water is dry." Lake Tiberius supplies a third of the water of Israel and also its water flows into the River Jordan. The problem is that today, Lake Tiberius has almost reached dead levels. It is dying very fast and is beyond recovery! It will go dry very soon.
So the conclusion has to be that G&M are already resident in the present day world. Out of this inference comes a whole host of conclusions, which just turns the traditional eschatology timescales upside down. The timing of Malhama, the coming of the Dajjal, the economic deprivation which will come through the droughts in that time, and all the escalation of suffering and chaos. Sadly, people do not care in this fragmented world. Here, the self has become all important and sceptics about religion and history are in fashion. However, there might be serious times ahead and the people of the world, need to stop worrying about economics and profits and start looking at how to make it more peaceful. This will be mankinds biggest test in its long history. We need to come together to face it.
Note: Eschatology is difficult to prove. It's part material substance, part belief and part historical reference. I have written this based on some research, but there are scholars who have spent decades and still are not certain. These conclusions are by no means the only argument out there. Allah knows best.