In Genesis, Cush was the father of the Seba, Havilah, Sabtah, Raamah, and Sabteca. He is also the father of Nimrod.
Cush is first mentioned in Genesis 2:12-14,
12(The gold of that land is good; aromatic resin and onyx are also there.) 13The name of the second river is the Gihon; it winds through the entire land of Cush. 14The name of the third river is the Tigris; it runs along the east side of Asshur. And the fourth river is the Euphrates.