Tunisia suits divers who like contrast more than hype. Tabarka and La Galite deliver caves, tunnels, walls, and protected-island ambition. Monastir and Mahdia give the country's cleanest beginner-to-wreck progression, with easy arrivals and strong mixed-group logistics. Djerba stays softer and shallower, with Posidonia meadows, beginner-friendly boat days, and a longer warm-water shoulder season. The appeal is not pelagics or tropical coral spectacle. It is Mediterranean texture, history, skill progression, and the ability to match coast, season, and certification level intelligently.