This wide-spreading meadow can be watered at will by damming up the streams which lead the water from the lakes to the abyss, and in a large cave near the edge of the precipice dwells a family of pastoral Bedouin who own this happy valley; before leaving the higher level we went to the edge and peered over into the hollow below, where, far beneath us, was our camping ground among the trees, and in the sun's rays the waterfall over the white cliff gave out beautiful rainbows. We had to cross much swampy ground, and got our feet wet, without catching the inevitable fever. Imam Sharif camped away from us one night and found that the streams which feed them have their source up in the limestone, about two days' journey from them. The Bedouin are exceedingly proud of them, and in the absence of much water in their country they naturally look upon them with almost superstitious awe and veneration. Perhaps in Scotland one might be more inclined to call them mountain tarns, for neither of them is more than a mile in length, and in parts they are very narrow; yet they are deep, and, as the people at Al Hafa proudly told us, you could float thereon any steamer you liked, which may or may not be true, but their existence in a country like Arabia is, after all, their chief cause for renown. This really is Arabia Felix. If ever this tract of country comes into the hands of a civilised nation, it will be capable of great and useful development. Supposing the harbour restored to receive ships of moderate size, the Gara hills, rich in grass and vegetation, with an ample supply of water and regular rains, and, furthermore, with a most delicious and health-giving air, might be of inestimable value as a granary and a health resort for the inhabitants of the burnt-up centres of Arabian commerce, Aden and Maskat. It is, as I have said, about half way between them, and it is the only fertile stretch of coast-line along that arid frontage of the Arabian Peninsula on to the Indian Ocean.