Geography Nempont-Saint-Firmin is situated in the valley of the Authie river , the border with the department of the Somme , some NUMBER@1 miles -LRB- NUMBER@2 km -RRB- south of LOCATION@1 , on the NUMBER@3 road .

It is found in the region Nord-Pas-de-Calais in the LOCATION@2 department in the north of LOCATION@3 .
