When we talk about the cult of waters in Sardinia, we must inevitably refer to the sacred wells, a distinctive element of Sardinian Megalithic heritage. They are temples called “hypogea”, dating back to the last years of the Bronze Age (about 3500-1200 BC) and the beginning of the Iron Age (about 1200-900 BC). Their architectural structure reminds that of the nuraghi, but with an important difference: they were built underground.