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.
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Laaroussien Sahrawis are present both in the Tindouf refugee camps of Algeria, headquarters of the nationalist and independence-seeking Polisario Front, and in their traditional home areas of Western Sahara; these are situated west of the Moroccan Wall, and thus under Moroccan rule.
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The Laaroussien (also spelled Larosien, Laârousienne, Aarousiyine, al-Arosien, etc.) is a Sahrawi tribe traditionally migrating within the region that is today the disputed territory of Western Sahara.