Yardna

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. 'living water'; pronounced meyya heyyi) that is suitable for ritual use as baptismal water. The masbuta and other Mandaean rituals such as the tamasha can only be performed in a yardna. Stagnant fresh water, brackish water, and seawater are not considered to be yardnas.

Unlike in Islam, Christianity, or Yazidism, no earthly geographic location is exclusively considered to be sacrosanct in Mandaeism. This is because Mandaeism does not have shrines, holy sites, or pilgrimage sites tied to specific geographical locations, since any river with flowing water can be used for religious rituals.