Kroussia (Krussiah in historical documents; Arabic: كروسيا or كروسية) is a sector located in the mid-east of Tunisia, belonging to the delegation of Sidi El Hani and the governorate of Sousse.

Based on a manuscript dating back to 1651, Kroussia was part of Zaouiet (Corner) of Sidi Ali Louhichi (Arabic:سيدي علي الوحيشي) in Kairouan.

Although there has not been huge archeological discoveries in this region, a few artifacts found in different places of Kroussia indicate that if archeologists and historians gave more focus on the area, their efforts would not be in vain.

According to Foucher,[9] the seventh line of the engravings XXCVII corresponds to the number 87, which could refer to the distance of a secondary route connecting Sufetula (now known as Sbeitla) to Hadrumetum and passing by Kroussia.

[12][13][14] A recent study by Gadhab[10] suggested that the milestone of Kroussia was actually a boundary stone where four juridical territories intersect: 1) Chrausa in the north-west, 2) Gurza (Kalaa Kebira) in the north-east, 3) Vicus Augusti (Sidi El Heni) in the south-west, and 4) Cynazyn (Kneiss) in the south-east.

Until today, the residents of Kroussia find some coins and artifacts dating back to different historical eras (e.g., Imperial Rome and Islamic Empire), which may motivate archeologists to proceed the unfinished research in this interesting region.

This domain was first discovered in 1881 where the French military came across at least 15,000 fighters from different indigenous tribes (Oulad Said, Souassi, Mthellith, Hammama, Zlaaz, and Beni-Zid) who were protecting the saint city of Kairouan.