EntityQ2019122· pop 6· linked from 6 articlesOleftalsperreSign in to savereservoir in GermanyConnectionsOlefEntityGermanEntityNorth Rhine-WestphaliaEntitygeographic coordinate systemEntitydamEntityWayback MachineEntitydrainage basinEntityInternational Standard Serial NumberEntityEuskirchenEntityBütgenbachEntityHellenthalEntitythalwegEntityEifel National ParkEntitybuttress damEntityHigh Fens – Eifel Nature ParkEntityInnogyEntityRur DamEntitylist of dams and reservoirs in GermanyEntityCategories1950s architectureBuildings and structures in Euskirchen (district)Buttress damsDams in North Rhine-WestphaliaEconomy of North Rhine-WestphaliaHydroelectric power stations in GermanyRWE