Lâm Cung Thánh Mẫu (林宮聖母) or Mẫu Thượng Ngàn or Bà Chúa Thượng Ngàn (Princess of the Forest) is ruler of the Forest Palace among the spirits of the Four Palaces in Vietnamese indigenous religion. In legend the Princess of the Forest was the daughter of prince Sơn Tinh and Mỵ Nương, công chúa Quế Mỵ Nương King Hung's daughter from the legend of the rivalry between Sơn Tinh and the sea god Thủy Tinh. Many natural features around Vietnam feature shrines to her, such as the Suối Mỡ thermal springs area near the town of Bắc Giang.
References
Mẫu Thượng Ngàn Wikipedia(Text) CC BY-SA