1923%20Memoir%20on%20Maps%20of%20Chinese%20Turkistan%20by%20Stein%20s

73 NO'I'ES ON INDIVIDIJAL AIl\l' Sl-Il4;N'l'S [Chap. IV
topog~q>llicrrl cletails concerning AIr. Johnson's
Yangi-tlawin ant1 his ront,e beyond
towards Iiamngl~n-tfigh, see my notc on Johirson's
mop and fAt3 fqogropl~y of tAe K'ritr-lus
sotrlir ?fKhhotnx, in t.l~e Abine .Jonr~1nl,19!21,
xsxiv. 1)p. 62 sqq.
Limited ;ts tl~c actually snrveyed area
within this shcet is, it inclrtdes t.l~ree wellmarked
l)ort.ions of tlistinct,ive character :
utterly sterile basins characteristic of tho
extreme uort,l~-\vt.st of Tibet.; the main K'onlun
range \\-it11 its deep-cut valleys draining
nortl~nrard into t,lie l'uriung-liish river, and
the high open between the Kara-
NOTES ON SHEET No. 11 ( hIUZ-;IHT)
r 1 he snrvey sho\vn in this sheet is contined
to tllc vieinit,y cf tl~c route leading from
the south to the Muz-art pass on tire main
Pien-shan range, :tnd to a small portion of
the ont,er hills above the tract of Ka.ra-bsgh.
The l)la~~c-tal~lc work of R.. 13. 1,il Sing11
was atljustt~cl to tllc 1)osition adopted for t,l~e
Tongri-l;11511 Peali in the map accoinpai~ying
Dr. Rlerzbac.l~er'r IlXe Ceafrol Ili'aa-shnx
Mot~ataills, London, 1905, and to the plotting
of the ntljoining sheet No. 12.
The heigI1t.s sho\~o for Tengri-lt11,in and
NOTES ON SHEET No. 12 ( KARA-Y ULGI-IUN, BAI )
Of the rontes falling within this sheet
only those from the terminal conrse of t.he
Khotau river to Ak-su and north-east of this
town were follo\ved in 1908; the rest were
all surveyed in 1915, that along the foot of
the monntains by H. n. LA1 Singh, the one
between Bzi and Ak-su by myself, and the
two further sooth by surveyors Afriz-gnl
and AInhammad Yak Glt, respectively.
The plot,ting of the sheet is based on
the positions adopted for Ak-st1 and Knch%
in Sheets No. 7, 17 and on that for the junc-
t,ion of the ilk-su and Ytirkand rivers. For
the latitude of the last the valne observed by
Dr. Iiedin, viz. 4.0' 38' 47", was used, while
the longitt~de adopted is the mean between
the values obtained by interpolation hetween
Kishgar and Korla and between Kilotan and
Ak-su. Latitude observations taken by Dr.
Hedin were utilized for a number of points on
the Tirim river. For AIuhammad Yakab's
traverse along this river, a check on longi-
tude was afforded also by tlre position of Peres
liolnm and tho Kara-kiislr rive]..
Corrections. D. 1. The ascent 1111 the
glacier at the head of the Turgap valley
(Sl~rct No. '3. I). -I.), to about long. 7'J0 42'
]at. 35O 59') ought t,o have been intlicated;
cf. Bt,sc!rt Cn/An!y, i. 200 sy.
D. 2. The al>l)roxi~nate 110sition of
Mr. Johnson's ' Naiit Khkn-dawirn ' ]nay
eonjecturally be placed at about long. 79' Mi'
]atr. SjO 58'.
D. 2. l'ealc 8/52r1 (23,509) has not
been sho\\~n on the map according to its comptltcd
longitude 79" 51' 0"; see rlppendis A,
points in 6 2 ~ .
another high snowy peak sighted fro111 tl~c
route are taken from Dr. RIerzbacl~er's map
in the Cet~frol Ti"irrw-shas Muawtai~ts. So is
also that of tl~e 11112-art pass, tlre snmmit
of which the surveyor was unable to rcacl~
o\ving to the heavy anow enconntered. 111s
visit tool< place in the lirat half of May \I II(*II
tl~e snow still 1:i.y low, and on this accou~~t
the aplxosin~ate level of tlre hnow-line a~ld
the estent of the glaciers SIIOIVII are st~bject
to doubt.
(Sheet No. 17. B. 2), where the former is
crossed by the desert route from Kucl~a to the
Keriya river. Similarly the adopted position
of l'engri-lihin (see Notes on Sheet No. I I)
was used for the adjustn~ent of t,he route
leading from Ak-su to the Muz-art pass.
In tllc northern portion of' the s11et.t
lies the s~~bordinate basin of Bai ( C, D. 1 ),
enclosed between tile foot.hills of tlre n~ain
ll'ien-shan and a much-eroded outer range.
The MIIZ-art ri~er and some of its tributaries
snpply irrigation to considerable t.racts in
t,l~is basin. The same is the ease with part,
of the submontane area betaween Ali-sn ant1
Jam (A. 2) nrhich receives water from the
sno\vy main range. Tl~e large volume of
the -4k-so river renders irrigation possi1)le
along both its banks for a considerable distance.
Between the fo~t of the above IIICIItioned
outer range and the jungle helt
accompanying the Tilrini stretches an area
of scrubby desert. The existence of certain