El Jem is a small city of 22,000 people, about 220 kms south of Tunis, and 25 kms inland (about 20 kms south and 25 kms east of Mahdia), which includes a roman amphitheater dating from the first century AD. It is a tourist destination, and it hosts a classical music festival in the summer. Took my boys and a nephew there for the day.
Based on a picture taken in the fall, meaning shorter days, non-oppressive heat, but very comfortable temperatures. What struck me is the tree with blooming flowers amid millennia old rocks