Piriawis
In Mandaean cosmology, Piriawis (Classical Mandaic: ࡐࡉࡓࡉࡀࡅࡉࡎ, Modern Mandaic pronunciation: [piriˈawis]; sometimes also spelled Biriawiš ࡁࡉࡓࡉࡀࡅࡉࡔ), also known as the Yardena Rabba (Classical Mandaic: ࡉࡀࡓࡃࡍࡀ ࡓࡁࡀ, romanized: Yardna Rba "Great Jordan"), is the sacred life-giving river (yardna) of the World of Light. It is the heavenly counterpart of rivers on Earth (Tibil), which are considered by Mandaeans to be manifestations of the heavenly Piriawis.