ERYTHEIA/GADES/CADIZ

Strabo

Geography

p55 Book VI, Chapter 2

"...... Now it was not at all necessary to fill out the whole of this circuit, but it was necessary, he thought, to
build up in a better way only the part that was settled — the part adjacent to the Island of Ortygia which had
a sufficient circuit to make a notable city. Ortygia is connected with the mainland, near which it lies, by a bridge, and has the fountain of Arethusa, which sends forth a river that empties immediately into the sea........"

"......Aetna dominates more especially the seaboard in the region of the Strait and the territory of Catana, but
also that in the region of the Tyrrhenian Sea and the Liparaean Islands. Now although by night a brilliant light
shines from the summit, by day it is covered with smoke and haze.

9 Over against Aetna rise the Nebrodes Mountains,135 which, though lower than Aetna, exceed it considerably in breadth. The whole island is hollow down beneath the ground, and full of streams and of fire, as is the case with the Tyrrhenian Sea, as far as the Cumaean country, as I have said before.136 275At all events, the island has at many places springs of hot waters which spout up, of which those of Selinus and those of Himera are brackish, whereas those of Aegesta are potable. Near Acragas are lakes which, though they have the taste of sea-water, are different in nature; for even people who cannot swim do not sink, but float on the surface like wood. The territory of the [Palici] has craters137 p93that spout up water in a dome-like jet and receive it back again into the same recess.

The cavern near Mataurus138 contains an immense gallery through which a river flows invisible for a considerable distance, and then emerges to the surface, as is the case with the Orontes in Syria,139 which sinks into the chasm (called Charybdis) between Apameia and Antiocheia and rises again forty stadia away......"

http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Strabo/6B*.html