At half-past four o’clock in the afternoon we had gradually begun to change our direction from north-west by west to south. The valley was bordered by a deep chasm and craggy mountain to the right, and a range of grotesque promontories towards the left, the slope of which was broken into a variety of terraces, with several cones rising from them. At length, turning round the edge of the mountain range, we entered the broad valley of Tánesof, having before us the isolated and castellated crest of Mount Ídinen, or Kasr Jenún, and on our left the long range of the Akakús, beautifully illuminated by the setting sun, and forming a sort of relief in various colours, the highest precipitous crest, with its castles and towers, being white, while the lower slope, which was more gradual and rugged, disclosed regular strata of red marl. Towards the west the valley, about five miles broad, was bordered by sand-hills, whence the sand was carried by the wind over its whole surface. We ourselves encamped at length on sandy soil without the least herbage, while at the distance of about two miles a strip of green was seen running along the valley. [Illustration: SKETCH OF THE IDINEN.] Starting at an early hour the next day, we kept along the broad barren valley straight for the Enchanted Castle, which the fanciful reports of our companions had invested with great interest. Notwithstanding, or perhaps in consequence of, the warnings of the Tuarek not to risk our lives in so irreligious and perilous an undertaking as a visit to this dwelling of the demons, I made up my mind to visit it, convinced as I was that it was an ancient place of worship, and that it might probably contain some curious sculptures or inscriptions. Just at noon the naked bottom of the valley began to be covered with a little herbage, when, after another mile, beyond a depression in the ground which had evidently at one time formed a considerable water-pond, talha-trees and ethel-bushes broke the monotony of the landscape, while between the sand-hills on our right a broad strip of green was seen, coming from the westernmost corner of the Ídinen. Keeping still on for about five miles, we encamped in the midst of a shallow concavity of circular shape, surrounded by herbage, and near a large mound crowned by an ethel-tree. At some distance south-east we had the well Táhala, the water of which proved very good. As it was too late to visit the Ídinen to-day, I sat down in the shade of a fine talha, and made the subjoined sketch of it. In the evening we received a visit from two men belonging to a caravan laden with merchandise of Ghadamsíyin (people of Ghadámes), which was said to have come, by the direct road through the wady, in thirty days from Tripoli.