It is located on the Marmilla plain, between the Mannu river and the Trexenta hills, surrounded by the Giara di Gesturi flood basalt plateau and by that of Siddi. Lunamatrona is a small village with agricultural and pastoral traditions and fewer than two thousand inhabitants. The name apparently comes from Juno Matrona, in honour of Juno: a temple dedicated to her may have been located here. Its agricultural production is well-known: legumes, olive oil and Malvasia, a wine at the centre a feast at the beginning of September, along with melon and 'pecora in cappotto' a stew made from sheep meat.

In the centre of the village, there is the parish church of San Giovanni Battista, the style of which is classicist with some seventeenth century inspiration. It stands on the site of a previous Benedictine church (11th century) and was built between the end of the 16th and the beginning of the 17th century. Inside, there is a single barrel vault, with four chapels on each side. In the first on the right, there is a retable of Santa Maria (St Mary), originally kept in the little church of the same name. The paintings depict episodes of the life of Christ, of the Virgin Mary and of the saints. The celebrations in honour of San Giovanni (St John) take place at the end of June.