The Dinka, or Jieng/Muonyjang, are a Nilotic ethnic group in South Sudan. In Dinka mythology the supreme, creator god is Nhialic (also known as Jaak, Juong and Dyokin by other Nilotic groups such as the Nuer and Shilluk). He is believed to be present in all of creation, and to control the destiny of every human, plant and animal on Earth. Nhialic is the god of the sky and rain, and the ruler of all the spirits. The term "Jok" refers to a group of ancestral spirits.