Biological invasions are considered as one of the most serious threats to the biodiversity. Mesembryanthemum crystallinum L. (Aizoaceae) is reported invasive in many regions over the world. This paper aim to monitor its distribution in the Kerkennah islands and update its invasive status. Field surveys, performed during May 2022, were achieved to record M. crystallinum occurrences and generate the plant distribution map. Field monitoring reveals that M. crystallinum is widespread and has the ability to grow in a broad range of disturbed habitats. The plant distribution pattern show that it often forms dense stands which allow it to inhibit the growth of other plants. Concidering its behaviour M. crystallinum should be considered as a potential invasive plant in Tunisia which requires the implementation of an appropriate management plan.