Tamerza (or Tameghza) is the largest mountain oasis in Tunisia, known as Ad Turres by the Romans. It has a canyon and an abandoned old town. The town was abandoned after the river flooded for 22 days in 1969. It is located north of the salt lakes and receives fresh water from the nearby hills. It is in the hill country near the border with Algeria, and is 6km from Mides.