'The Expedition for the survey of the rivers Euphrates and Tigris, carried on by order of the British government, in the years 1835, 1836, and 1837; preceded by geographical and historical notices of the regions situated between the rivers Nile and Indus. In four volumes. With fourteen maps and charts, and embellished with ninety-seven plates, besides numerous wood-cuts. Volume the first.' [‎194] (251/905)

194
AND ITS TRIBUTARIES.
[CHAP, IX.
thence, a tributary coming from the Guran mountains by a
westerly course, and passing by the tomb of Baba Buzurg.
Below this junction, and under the name of Kara su, it runs
S. by W. for nearly 60 miles, traversing the Kohi Tourdulan
and plain of Terhan, in the district of Pish-kuh; and, finally,
through the great chain of the Zagros, to the ruins of Shahri
branch 1 . mnd Rudbar, 1 which are situated at its confluence with the river
of Kirrind. This is a very considerable stream, which rises
close to the gates of Zagros, and has a tortuous course of
nearly 100 miles in a general S.E. direction. In the latter
part of its course, it forces its way through the Zagros, by a
tremendous gorge, into the plain of Zangawan; being then
at a distance of about 12 miles east of the ruins of Sirwan.' 2
From thence it takes the name of Abi-Sirwan, as it passes,
m a S.S.E. direction, through the valley of Rudbar; being
increased^ almost at the junction, by the Zangawan, the
Abi-Sirwan, and two other streams; all of which come from
the west. 3
SSi 0 ' ™ e 1 un i ted waters of Kara su and Abi-Sirwan, now
called the Kerkhah, follow the Zagros in a S.S.E. direction
lor about 30 miles, through the plains of Lort and Seimarrah,
as fer as Pfih-Gamashan. At eight miles east of the ruins
oi Seimarrah, and one mile above the bridge, the Kerkhah
is joined, on the N.E. side, by the Kashghin, a large stream
which rises in two branches on the Kuhi-Chihul Na Ba-
lighan at some distance beyond Khorram-abad, 4 in the plain
"t^-? U t; and ' after bein S j oined ^ the united streams
of Khorram-abad, Kayun, and Tayin, the main trunk runs
south-westward, through the plain of Jaidar, and over a
number of precipices, forming a succession of magnificent
cataracts, as it struggles through the outer rampart of the
Zagros into the valley of the Kerkhah, some thousand feet
below the hills. 5 At about 22} miles S.E. of the bridge of
Xt.?""'" •'' "•
• MS M l0n!e ° f , Diodonls ' Iib - XVII., c. xi.—Ibid, p. 65.
' MaAorRawUnson^ f""" 80 "' „ ' 111 the ^tion of Hamadin.
Part I., p. 61 Journal of the Royal Geographical Society, Vol. IX.,