In Mandaeism, a yardna (Classical Mandaic: ࡉࡀࡓࡃࡍࡀ, romanized: iardna, lit.
'Jordan') or yardena ([jardəna]; Arabic: یردنا) is a body of flowing fresh water (or in Classical Mandaic: ࡌࡉࡀ ࡄࡉࡉࡀ, romanized: mia hiia, lit.
[5] In Mandaean scriptures, the Euphrates is considered to be the earthly manifestation of the heavenly yardna or flowing river (similar to the Yazidi concept of Lalish being the earthly manifestation of its heavenly counterpart).
[9] In Sweden, particularly during the winter, indoor pools with flowing water are used as ritual yardnas in mandis.
[5] Shilmai and Nidbai are the two guardian uthras (celestial beings) watching over Piriawis, the heavenly yardna in the World of Light.