Pison, an eminent branch of the river Tigris, probably that called by others Pasi-tigris, or Piso-tigris. That is it which compasseth, i.e. with many windings and turnings passed through; as this word is used, Joshua 15:3 Matthew 23:15. This whole land of Havilah; either that which is in those parts of Arabia which is towards Mesopotamia, so called from Havilah the issue of Cham, Genesis 10:7; or that which is nigh Persia, and in the borders of India, so called from another Havilah of the posterity of Shem, Genesis 10:29. To either of these following the description agrees well.
Related Commentaries of Genesis 2:11
Genesis 2:11
11 The name of the first is Pison: that is it which compasseth the whole land of Havilah, where there is gold;