She presides over the heavenly water palace Thoải Phủ, one of the
Four Palaces (Tứ Phủ) where the "spirits of the Four Palaces" (thánh Tứ Phủ) correspond to the elements.[2]
References
^Hy V. Luong Tradition, Revolution, and Market Economy in a North Vietnamese ... - Page 307 2010 "In Sơn Dương, many of the non-Buddhist deities — mẫu thượng thiên (goddess of the upper sky), mẫu thượng ngàn (goddess of the highlands), mẫu Thoải (goddess of water), Hắc hổ (black tigers), etc. - were worshipped in the house.."
^Karen Fjelstad, Thị Hiền Nguyễn - Possessed by the spirits: mediumship in contemporary Vietnamese ... - Page 20 2006 "A number of goddesses have been elevated to the rank of mau (mothers). ... presides over each one of the four realms or "palaces" (tu phu): Heaven (thien phu), Earth (dia phu), Water (thoai phu), and Forests and Mountains (nhac phu)."