The name means ‘the sands’, or more specifically 'sand dunes' and they are among the most extensive in Italy. It is a small desert, where reforestation began in the 1950s, with pines and acacias, because the dunes risked expanding and turning the internal area into a desert. Today it has become a vast green area, where there is a pine forest and a golf course. Is Arenas (or Sas Renas) stretches for almost six kilometres: it is one of the longest beaches in the Oristano area, delimited to the north by the tip of Torre del Pozzo and to the south by a canal that links the sea and the pond of Is Benas. The central (and largest) part of the sandy shore is in the territory of Narbolia, while the southern part is in San Vero Milis and the northern part is in Cuglieri.