Armageddon  from the ancient Greek: Aρμαγεδών (Harmagedōn), is the prophesied location of a gathering of armies for a battle at the end times, as mentioned in the Book of Revelation and variously interpreted as either a literal or a symbolic location/event.. The term is also used in a generic sense to refer to any end of the world scenario

 Armageddon is translated from the Hebrew har məgiddô meaning "a mount at Megiddo" . Not originally a hill, it was built up by many generations of people living and rebuilding on the same spot. It is located on ancient trade route linking Egypt with the northern empires of Syria, Anatolia and Mesopotamia.  It is the site of various ancient battles, including one in the 15th century BC and one in 609 BC.  The site is currently occupied by the town of Megiddo is a town located approximately 25 miles west-southwest of the southern tip of the Sea of Galilee in the Kishon River area in Israel.

Christianity

Though the word Armageddon appears 12 times in the Old Testament, with no prophetic association, it occurs only once in the New Testament, in Revelation 16:16,where it seems to be a place for the gathering of nations in the last days at  "the war of the great day of God, the Almighty".

The traditional Christian viewpoint interprets this Bible prophecy figurtively as a symbol of the "great day of God, the Almighty" in which God's just and holy wrath is poured out against unrepentant sinners, led by Satan, in some final confrontation. Armageddon is the symbolic name given to this event based on scripture references regarding divine obliteration of God's enemies. In Judges  Megiddo is called the Valley of Jehosaphat.

Dispensational Christianity interprets this prophecy literally and expects that the fulfillment of prophecy will also be a campaign and not a specific battle, which will be fought in the Middle East. They mention the "hill of Megiddo" and other geographic locations such as "the valley of Jehoshaphat" and "the valley of the passengers", "Lord coming from Edom or Idumea, south ofJerusalem, when he returns from the judgment"; and Jerusalem itself.  They conclude that it must take place at a

 
specific  time.   The invasion of Israel by the Northern Confederacy "will bring the Beast and his armies to the defense of Israel as her protector".

After the destruction of the Beast at the Second Coming of Jesus, the  is set up, in which Jesus and theSaints will rule for a thousand years. Satan is then loosed "for a season" and goes out to deceive the nations, specifically, Gog and Magog. The army mentioned attacks the Saints in theNew Jerusalem, they are defeated by a judgment of fire coming down from Heaven
 
Armageddon as it looks today.