IIIFカラー高解像度
国立情報学研究所 - ディジタル・シルクロード・プロジェクト
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| IIIFカラー高解像度 |
| Southern Tibet : vol.3 | |
| 南チベット : vol.3 |
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引用情報
320
TIIE FIFTH CROSSING.
the largest. From Camp 384, where the height is 4 832 m, the valley makes a sharp turn to the S.S.W. The living rock is here calcareous schist. From Samye-la to Camp 384 the river has followed the great latitudinal valley, which begins at Tarok-tso. But in the neighbourhood of Camp 384 this valley comes to an end, and the river pierces the southern or Lunpo-gangri range, which is much lower here
than further N.W.
The often interrupted terraces are i o to 15 m high; the road either follows their tops, or goes along the slopes or in the bottom of the valley. Rapids become more frequent; the ice disappears. In the background of two pretty large valleys from the north comparatively high mountains are to be seen. The river grows gradually and has at Camp 385 4 cub. m, after having received the great right tributary Rukchok, which seems to originate from the southern side of the Lunpogangri. The joint valley goes to the S.E. and becomes broader; to its right, S.W., are considerable mountains with some snow on their northern slopes. The rock is green schist. To the N. 57° W. and N. 62° W. the two highest peaks of Lunpogangri are still visible.
Camp 386 is at the bank of Chaktak-tsangpo, which here carried (April 19) t 6 cub. m; a short distance below this camp the joint Samye-Rukchok river enters the Chaktak, which continues southwards past Pasaguk to the great Tsangpo. At Camp 386 the valley of the Chaktak-tsangpo is fairly narrow; it has a well developed terrace at its left side; to the N. 49° E. a snowy peak is visible. The solid rock is green schist. This region is a real labyrinth of mountains and deep wild valleys.
Continuing eastwards I one day got an opportunity to follow this part of the middle Chaktak-tsangpo upwards; above Camp 387 the river pierces the Kanchung- gangri, and, below Camp 386, it pierces the Lunpo-gangri, and therefore shows itself to be a very energetic river. We have found its sources to be situated on the Lapchung range at both sides of the Sangmo-bertik-la. Some nomads at Camp 387 called the river Lap-kamba and its valley Lap-lungpa and asserted that the name Chaktak-tsangpo was only used below Pasa-guk.
Above Camp 386 the Chaktak valley is broad, about I km, and the ascent slow; the erosion terraces are sharp cut; there are good pasture grounds in the bottom of the valley. This part of the valley is fairly straight and the river not very winding. Sometimes the river is divided into several arms. Only one considerable tributary enters from the south; from the north there are several smaller tributaries. At Camp 387 we again leave the Chaktak-tsangpo which, in its lowest part, is seen coming from the N. 10° W. The height is 4 702. The general direction is, however, N.E.—S.W., as the river comes from Lapchung-tso, which is situated to the N.E. Not far away to the N.N.E. two moderate snowy peaks are visible, said to send a considerable tributary to the Chaktak-tsangpo. A little triangular plain is formed where the two rivers meet. The main river was called
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