Dualchi stands more than 300 metres above sea level in the northern part of the basalt plateau of Abbasanta, in the historical territory of Marghine. The village now has a population of 600 and survives on agriculture and sheep-farming. It is surrounded by dense woodland, and country paths offer a pleasant way to explore nature. The territory has been settled since the Neolithic, as demonstrated by various megalithic monuments, including domus de Janas, and was assiduously inhabited in nuraghic times. Spread out among the pastures and deep valleys are the nuraghes of Biriola and Bardalazzu and, above all, the well-preserved complex that includes the Cubas protonuraghe and the 11-metre-high Ponte nuraghe, one of the most important thanks to its construction technique using large blocks. You can also admire Giants' Tombs and truncated-cone-shaped baetyli. There are also remains from Punic and Roman times: to the south of the village lies a Roman necropolis, dating from the 3rd and 4th centuries AD.