Riencourt-l Ã s-Cagnicourt is a commune . It is found in the region Nord-Pas-de-Calais in the Pas-de-Calais department in the north of France .
Riencourt-l Ã s-Cagnicourt is a commune in the Pas-de-Calais department in the Nord-Pas-de-Calais region of France .