River Phoinix at Thermopylae

This image depicts a view of the river Phoinix, at Thermopylae. According to Herodotus, who provides the history of the battle between the Greeks and Persians in 480 BCE:

There is also another river called Phoinix, [meaning, “the purple one”] to the south of the Asopus, of no great size...Behind the river Phoinix is the narrowest place, for here has been constructed a road with a single wheel-track only. Then from the river Phoinix it is a distance of three kilometers to Thermopylae.