Deuteronomy 3:11

For only Og, king of Bashan, remained of the remnant of giants, of the nations of giants that had formerly inhabited this region, Genesis 14:5; behold, his bedstead was a bedstead of iron; is it not in Rabbath of the children of Ammon? where Og may have left it on one of his campaigns of conquest. Nine cubits was the length thereof and four cubits the breadth of it, after the cubit of a man (at about 18 inches per cubit). Rabbath was the capital of the children of Ammon, and its ruins may be seen to this day.