- Gilliam County, Oregon has 1,204.7 square miles of land area and is the 24th largest county in Oregon by total area. Gilliam County, Oregon is bordered by Wheeler County, Oregon, Wasco County, Oregon, Morrow County, Oregon, Sherman County, Oregon, and Klickitat County, Washington.
And the name of the second river is Gihon: the same is it that compasseth the whole land of Ethiopia.
Genesis 2:13 KJV