[ Rex considers each question in turn and answers then earnestly. ]

I imagine it is at least three hundred square miles in area, but that's a conservative estimate. I doubt there would be any oases, as they require vegetation and often must be maintained- there may be guelta, though. Those are sitting water in stone or valleys. Due to the flat land, it's relatively reliable we would be able to see other ruins, yes.

[ He follows behind, glad of the distraction- obtaining knowledge is the greatest but having questions to answer is almost as fun. ]

The tallest one does appear to be some form of a chapel, so it is entirely possible it contains at least one bell. A dragon would likely have left before starvation killed it, even if one would lower itself to live with humans. As this is the Outlands, I would speculate we may find the remains of an inhuman race of some sort.

[ With them exchanging motormouth questions and carefully chosen answers, the tower is in reach. Rex takes a moment to look it over with a discerning eye- his scavenging habits is one of the reasons he's known as Black Dog, and he knows ruins well. ]

Looks stable.

[ It, in fact, does not. It looks like it might go over any second, to his expert eyes, but that suits him. ]