Juok is the name of god for the tribes on the upper reaches of the Nile

Nile

The Nile is a major north-flowing river in North Africa, generally regarded as the longest river in the world. It is long. It runs through the ten countries of Sudan, South Sudan, Burundi, Rwanda, Democratic Republic of the Congo, Tanzania, Kenya, Ethiopia, Uganda and Egypt.The Nile has two major...

. For some including the Shilluk, Dinka and Nuer, he is the Creator God and is omnipresent. Nyikang, a legendary king, is often invoked as an intermediary. Other Nilotic tribes, for example the Acholi and Lango, use the possibly related term Jok only for local and/or ancestral spirits.