The volcanic island of Sicily, encircled by mountains, is a very fertile terroir for growing oranges. The island's mountains mostly comprise tertiary land, known as "Trubi" or "sandy marls", where the soil is rich in chalk, minerals and fine yellow sand. This well-drained soil is ideal terrain for citrus groves. The orange trees that grow there are abundantly laden with fruit. Moreover, the mountains abound with small streams which provide a steady supply of water and allow the growth of healthy trees. The naturally sunny climate of the island also contributes to the fine quality of Sicilian oranges and gives the Ponthier purée a fresh and vibrant fragrance.