One of Cain's descendants boasts of killing a man (Ge ).
For two millennia scholars have sought to identify the "land of Nod" as well as the "land of Eden" and its garden. The name of the land where Cain went after he had killed his brother Abel...
If asked to briefly summarize _my_ understanding of the Hebrew God, Yahweh-Elohim, it would be best encapsulated by the Latin Motto now found on the money of the United States of America: "From Many, One." That is to say I understand that the Hebrews took the many gods and goddesses of Mesopotamia, Syria, Canaan and Phoenicia, and ascribed their powers, feats, epithets and personas to their God.
That is to say themes associated with the Epic of Gilgamesh have been recast in Genesis' story of Cain and the Land of Nod east of Edin.
Enlil (Akkadian Ellil) and Enki (Akkadian Ea of Eridu) determine that the hard labor protested by the Igigi gods in their city-gardens, creating irrigation canals and ditches and planting seed, hoeing weeds and harvesting the produce to feed the Anunnaki gods is not without just cause.
To end the revolt of the Igigi at Nippur (and at Eridu) Enki decides to create a new laborer with Enlil's assent to work in the gods' city-gardens, man will bear the work basket of the gods.
I understand that Eden and its garden is a Hebrew myth based upon later recastings of motifs and concepts appearing in earlier Mesopotamian myths regarding primal man's origins of the 3rd through 2nd millenniums B. Gen ...locates it "east of Eden." The land of Nod is not mentioned elsewhere in the Bible.
It is unlikely that an actual geographic location is meant.