What is "houtu"

Hòutǔ (Chinese: 后土, "Queen of the Earth") or Hòutǔshén (后土神 "Goddess Queen of the Earth"), also Hòutǔ Niángniáng (in Chinese either 厚土娘娘 "Deep Earth Lady" or 后土娘娘 "Earth Queen Lady"), otherwise called Demǔ (地母 "Mother Earth") or Demǔ Niángniáng (地母娘娘 "Lady Mother Earth"), is the deity of deep earth and soil in Chinese religion and mythology. Houtu is of ambiguous gender. She is the consort or female form of Tudigong ("Lord of Local Land").