Invisible Rivers

Fresh water also flows to sea through the ground

About 2,000 years ago, the Roman geographer Strabo wrote about the residents of Latakia, Syria, who rowed their boats 4 kilometers out into the salty Mediterranean, dove a few meters to the ocean floor, and collected fresh drinking water in goatskin containers for their city. No miracle, this—marine boaters could do the same today at a spot about 10 km east of Jacksonville, Fla.