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Few members of the Laaroussien live in neighbouring Mauritania; they are not a transfrontier tribe, traditionally, although, as an exception to the rule, a former President of Mauritania (1979–84), Col. Mohamed Khouna Ould Heidallah, is Laaroussien - he is born in or near the border region of Ras Nouadhibou, either in Mauritania or what was then Spanish Sahara.
Other members of the tribe Mauritania's first President, Moktar Ould Daddah; and his half-brother, Ahmed Ould Daddah, who was one of the main contenders in the 2007 Presidential elections in Mauritania.