Sumer

"A puzzle remained. Why had Dilmun used the standard weights of the Indus Valley? The Babylonians and Sumerians used a completely different system... Either the first commercial impulses to have reached Dilmun must have come not from Mesopotamia but from India, or else India was a far more important commercial connection with Dilmun than was Mesopotamia."

"There is even some possibility that Dilmun may turn out to include the region in Pakistan and India where a remarkable urban, literate culture flourished toward the end of the third millennium B.C., the so-called Harappan, or Indus Valley, culture."