If you guessed Jehoshaphat, you guessed the correct location, but you chose the wrong name.  It is called the Valley of Decision in the phrase I just gave you.  I am sorry for this, but you are still in the tutorial, so there is no worry for your choice at the moment.  Who will fight the nations of this world in Revelation 19?

-The Antichrist-

-The church-

-The Jews-

-Jesus Christ-