The Nahr (River) Banias is the easternmost source of the River Jordan. The source of the Banias is located at a site we know as Caesarea Philippi in the New Testament. It is well known to those who study the ministry of Jesus (Matthew 16:13-19).
Banias is located on the eastern side of the Beka or Hula Valley. The valley is called the Beka in Lebanon, and a little further south the Hula Valley. The elevation is about 1150 feet above sea level in the foothills of Mount Hermon.
The photo below shows the place where the water emerges from the earth. Perhaps you are reminded of the text from the prophet Jeremiah:
for my people have committed two evils: they have forsaken me, the fountain of living waters, and hewed out cisterns for themselves, broken cisterns that can hold no water. (Jeremiah 2:13 ESV)
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Three other rivers we have recently mention, Flea River, the Senir, and the Dan, join with the Banias to form the River Jordan.