Imagine this… all around you see barren steep cliff mountains. And in the middle of that dryness, there is a waterfall.
So far so good. Then you dip your feet in the water and you realize that it is scalding hot. I mean from 113F to 140F hot!!
Completely unexpected. One thing that fools you is that you think you are very high. Actually you are nearly 900 feet below sea level.
The heat comes from veins that go deep into the magma. The whole Dead Sea lies on aa fault line (the larger African tectonic plate and the larger Eurasian tectonic plate)