Bithia or Bitia was a Phoenician, Carthaginian, and Roman town located near Chia in the extreme south of Sardinia, Italy. Most of the ruins have been submerged underwater.
Wikipedia https://en.wikipedia.org/wiki/Bithia,_Italy
Address 09010, Italy
Coordinates 38°53'53.48" N 8°53'25.301" E
