Yer-sub

Yer-sub (also Yer Su or Yir-sub) are a category of nature spirits in the Turkic-Mongolian belief of Tengriism. The name means "Earth–Water" in Turkic languages. Tengrist people believe that Yer-sub spirits exist in trees, lakes, mountains, stones, and sometimes in a whole empire, and that Yer-sub spirits are the forgotten souls of ancestors. They think that, if the name of an ancestor is not mentioned any more, that ancestor's soul will become object in the nature.