Bindus was the chief water-god of the Iapodes, an Illyrian tribe of the upper Una valley in modern Bosnia and Herzegovina. His sanctuary stood at the great spring at Privlika, where the Una river rose from underground; the cult-site has been excavated in the modern period, and a substantial corpus of dedicatory inscriptions to Bindus from the second and third centuries of our era has been recovered. The Romans identified him with Neptune (Latin inscriptions read 'Bindo Neptuno'), and his function corresponded broadly to that of a Mediterranean water-god — patron of the spring, of the river, of the fishing and the navigation that depended on the waters.
His cult was modest in scale but locally significant. The great spring of the Una was the chief water-source of the region, and the Iapodes had developed Bindus's worship around it from at least the late Iron Age. The Roman annexation of the area in the first century before our era brought the cult into the imperial system, with the Latin inscriptions dating from the Roman provincial period; the form of the deity's name was preserved (the dedications use the Illyrian name Bindus alongside the Latin Neptune), suggesting that the cult retained its indigenous character even under Roman administration.
The figure is one of many local water-deities in the Illyrian-Pannonian region. Each of the major springs and rivers had its tutelary spirit, and the corpus of Roman provincial inscriptions preserves names of dozens of such deities (Aequorna, Adsalluta, Savus, and others). Bindus is among the better-attested because of the concentration of inscriptions at his sanctuary; most of the other regional water-deities are known from only one or two surviving names. The pattern is typical of the Indo-European water-religion of the western Balkans — a network of local divinities, each tied to a specific water-source, with broader regional cults emerging only sporadically.
After the Christianization of the region, Bindus's cult disappeared from the public record, but the spring at Privlika remained a sacred site through the medieval and early modern periods (with various Christian shrines and pilgrimage practices replacing the older cult). The continuity of holy waters across religious transitions is one of the deepest patterns of European folk religion, and the Una springs preserve in their Christian form some echoes of the older Bindus-veneration.

