Usora (river)
In the early Bosnian history Usora belonged to  gold-bearing river, and it is believed that this is still in its upper course along with the many large and small tributaries and streams. Obvious hydro-energy potential Usora is permanently unused, and fish stocks almost negligible, especially if one takes into account the centuries-old discharging untreated waste industrial water Chemical Distillation of wood in Teslić.