That's the second Donga.Top right, there is a village, the road to its east. Part of the 'Durnford donga is just visible to its right. That's the upper reaches. The red circle away on its own isn't a cairn.
Steve have you compared it back with the map?
Bassage commented that the whole of G company fell where they were on guard duty that evening. So that furthest line of dots 'should' be Popes men. Theres around twelve or so, Mike Snook has the entire G company force being buried under those twelve.