Mauritania later abandoned all claims to its portion in August 1979 .
Mauritania later ceded this area to Popular Army of Saharwi Liberation ( Polisario ) , but it was instead promptly occupied by Morocco .
Mauritania later abandoned all claims to its portion in August 1979 and ceded this area to Popular Army of Saharwi Liberation ( Polisario ) , but it was instead promptly occupied by Morocco .