The Mari, formerly called Cheremis, are a Volga-Finnic, Finno-Ugric people. In their nature religion, Mari paganism, still living today, the world is pervaded by mother spirits, the ava: the earth mother, the forest, wind and sun spirits, and indeed the water mother. In the Mari context she is called Vüd-ava, literally water mother, from vüd, water, and ava, mother, and is the mistress of the waters and their abundance, especially the fish.
Structurally, she is identical to the Mordvin Ved-ava and the Estonian Vete-ema. Mari religion rests on tree and animal offerings in sacred groves, in which the veneration of the water mother is also embedded. The specifically Mari-named Vüd-ava is more thinly documented in the accessible sources than the Mordvin Ved-ava, so the description partly relies on the shared Volga-Finnic tradition.