Iranian border, Diyala Province, near Mandali, again you can see the overall view of this place on the Google sattelite map, it is the big valley thorugh the foothills of the Zagros mountains just to the northeast of Jisr-naft. The route was about 75 miles that looped around the the northeast/Mandali AO. 30x40 miles would be 1200 square miles so yeah it was big, and that was D/1/278th RCTs AO, a Troop, ours was the same size.