From this central point (Bore No. 1) lines of levels have recently been carried in every direction by Mr. F. E. Apted and myself, with the result that it has been shown that the general level of the floor of the oasis rises steadily to the north and falls to the south. These levels have in all cases been checked, and may, using the datum mentioned, be accepted as fairly reliable, the closing errors on the different loops being generally within a very few centimetres. The altitudes of a few reference points in each district are given here. +-----------------------+-------------------------+-----------+ | District. | Point. | Altitude. | +-----------------------+-------------------------+-----------+ | Headquarters | Bore No. 1 | 60·1 | | ” | Bore No. 44 | 53·1 | | Kharga | Bir Ain el Gôs | 70·2 | | ” | Ain el Sabbagh | 56·9 | | ” | Ain Zaaf | 87·7 | | ” | Temple of Hibis (floor) | 75·0 | | Meheriq | Bir Qattara | 56·6 | | ” | Ain Mahmud | 64·8 | | ” | Ain el Burg | 69·6 | | ” | Ain el Qasr | 76·0 | | ” | Ain el Ghazâl | 84·6 | | South of headquarters | Ain Harrân | 43·5 | | ” ” ” | Ain Ali Morad | 33·0 | | ” ” ” | Ain Bellal | 28·4 | | ” ” ” | Ain el Tawîl | 19·7 | | Gennâh | Ain Estakherab | 71·3 | | ” | Ain Magarin | 74·6 | | ” | Ain el Ghuâta (north) | 48·2 | | ” | Ain Zaiyan | 41·6 | | ” | Qasr Zaiyan | 20·7 | | El Dêr | Bore No. 22 | 92·3 | +-----------------------+-------------------------+-----------+ The Government Survey maps show a portion of the oasis floor as lying below sea-level, the difference of height between the Kharga village datum and a point just south of Qasr Zaiyan being given as 104 metres. Detailed surveying shows that this estimate is excessive, the true difference being about 37 metres only. Although no actual reading has yet been obtained below sea-level—the lowest being +2·6 metres at a point 3½ kilometres north-east of the northern end of the Gorn el Gennâh, or nearly midway between that hill and Ain el Tawîl—it is evident that in this district the floor is only very slightly higher than the sea, and it may be that at one or two points its level is actually lower.