Hello Sladys, - Thanks for your reply, although, I'm pretty well convinced that this is a central pivot irrigation system, (having looked elsewhere on the net), at first I could not believe that there was a mechcanical device that could be half a mile in length to irrigate this area, now, having seen the machine, I see how this is possible, but then I am from UK, where there is ample rain, and as such, would never have considered this necessary, if you look to left of the circle, you will see a white line, this, as far as i can see goes to the small lake, I think that must be the water supply, that's what I am thinking anyway, - the problem is now I have pledged to ride there on my bike to find out, - catch you later, all the best, Kahuczek