The ascent lasted perhaps for a mile; and the steep descent on the other side was about the same. Then we got to the level and found ourselves in a much broken country of ridges, with an intricate net of wadies whose main flow was apparently towards the southwest. The going was good for our camels. We rode for about seven miles in the dark, and came to a well, Bir el Murra, in a valley bed under a very low bluff, on whose head the square courses of a small fort of ashlar stood out against the starry sky. Conceivably both fort and causeway had been built by an Egyptian Mameluke for the passage of his pilgrim-caravan from Yenbo.