In Marmilla area few mountains and pretty hills surrounded Mont Arci

The Marmilla area is bounded by the Campidano plain on the south and on the west, by the Trexenta area on the east and by Arborea area on the north. Stretching out into the south its rivers (above all the Flumini Mannu one) are particularly erosional. It is in part plainly and in part hilly and is mountain are not so high. The highest top is Mont Arci. In many areas of this region there is some deep hollows where is difficult for the water to flow down into the sea.