Thibilis
Thibilis is a Numidian city in the Guelmas region of northeast Algeria .
The city is located 18 km south of Guelma (Calama). In the northern part of the city a small forum (27 x 12 m) is still relatively well preserved and in the southern part of the city a triumphal arch , which was built in the third century. Besides the Roman ruins, there is also a Byzantine basilica and the remains of a large Byzantine citadel .
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Coordinates: 36 ° 23 ' N , 7 ° 15' E