Another summit (20,490 feet) to the eastward might, as it stands at the head of the Chiche nullah, appropriately be termed the Chiche peak, and the glacier which descends from it to the end of the Rupal glacier, the Chiche glacier. A very good idea of the relative size and form of the great main range of Nanga Parbat on the north side of the Rupal nullah may be obtained from the top of the Kamri pass. The ridge to the westward of the true summit of Nanga Parbat, stretching as far as the Mazeno La, does not culminate in any very pronounced peaks. The lowest point, probably 19,000 to 20,000 feet, lies a little over a mile directly west of the top of the mountain. We have called this dip in the ridge the Nanga Parbat pass, and two peaks marked 21,442 feet and 20,893 feet the Mazeno peaks. To the eastward of Nanga Parbat the Rakiot peak, a superb snow-capped mountain, rises to the height of 23,170 feet, and here the main ridge turns considerably more to the north-east, ending in the twin Chongra peaks, 22,360 feet, which overlook Astor and the Chongra valley. Beyond these a sudden and abrupt fall in height of about 3000 feet occurs, and the ridge running more and more in a northerly direction, and never rising above 18,000 feet in height, constitutes the western boundary of the Astor valley. The height of our camp in the Rupal nullah was calculated from observations made with a mercurial barometer. The difference in level between the two cisterns was 531 millimetres, from which observation it was 9900 feet above sea-level.[F] We finally decided that it would be best to obtain a good view of the south face of Nanga Parbat before we made up our minds whether we should remain in the Rupal nullah. Two of us, Mummery and I, agreed to start the next day with the intention of combining business with pleasure; in fact, we had vague ideas about climbing the Chiche peak, 20,490 feet.