G-man, you're absolutly right, the GE border (yellow line) is probably where the UAE would have liked it to be when this was negotiated with the Saudis!!! Reality is that the current border is actually 10 to 15 km North of that yellow line.
Xof, you can take the tarmac road that runs along the Omani border only to the Umm Zumul check point, after that you will have to be very brave to sneak your way around the UAE military.
Fuel availability in the area, simple to remember, only two ADNOC stations, one in Al Quaa and one in Hameem, the other option is the small pump at the Car Museum if still open (haven't used that pump for a while).
Having said that there is so much opportunities to drive off-road (dunes or tracks as much as you want) in the area between the Hameem road and the road South of Al Quaa that I would bother try to go past the Umm Zumul check point, the rest is really wide open for discovery. See the GPS tracks (off-road red, tarmac black) of the trips done over the years for inspiration if need to be.
BTW, if you're French you should enquire within the French off-roading circles, "la piste des gazelles" is a well known trip in their community (and probably others) and it seems to be passed on from one expat generation to another, it crosses the Ramlat Al Hamra right in the middle and can be done as easily or as difficult as you want.
Having said that, Bulldozer is right (damn the man is always right! I totally agree on the comments he recently made on dune cresting or wet sand driving and on car modifications, i.e. people should enjoy and learn driving their cars the way they are originally built and focus on discovering places rather than thinking about modifications from the onset, only much later should the bug of modifying cars be allowed in if that's what you want) some of the areas of the Ramlat Al Hamra are natural reserves where you can see plenty of gazelles and in a couple of places Oryx, but you can also see the Abu Dhabi Environment officers and depending on the exact place, person and mood they may not let you go everywhere you would like to.
Also, they are building since last year an airfield in the Sabkha that our most South East (red) track crosses, just before the tarmac road near Umm Zumul, and given the place you can guess that this is not going commercial aviation, so we've kept out of that corner since.
, we wil be in alAin airshow on Fri 30 join us 
great minds think the same!!! :okfriend:
