h of Multan joins the Chenab near the Jhang border. In
Multan there is a remarkable straight reach in the channel known as the
Sidhnai, which has been utilized for the site of the head-works of a
small canal. The Degh, a torrent which rises in the Jammu hills and has
a long course through the Sialkot and Gujranwala districts, joins the
Ravi when in flood in the north of the Lyallpur district. But its waters
will now be diverted into the river higher up in order to safeguard the
Upper Chenab canal. Lahore is on the left bank of the Ravi. It is a mile
from the cold weather channel, but in high floods the waters have often
come almost up to the Fort. At Lahore the North Western Railway and the
Grand Trunk Road are carried over the Ravi by masonry bridges. There is
a second railway bridge over the Sidhnai reach in Multan. Though the
Ravi, like the Jhelam, has a course of 450 miles, it has a far smaller
catchment area, and is really a somewhat insignificant stream. In the
cold weather, the canal takes such a heavy toll from it that below
Madhopur the supply of water is mainly drawn from the Ujh, and in
Montgomery one may cross the bed dryshod for months together. The valley
of the Ravi is far narrower than those of the rivers described in the
preceding paragraphs, and the floods are most uncertain, but when they
occur are of very great value.

[Illustration: Fig. 15. Bias at Manali.]

~The Bias.~--The Bias (Sanskrit, Vipasa; Greek, Hyphasis) rises near the
Rotang pass at a height of about 13,000 feet. Its head-waters are
divided from those of the Ravi by the Bara Bangahal range. It flows for
about sixty miles through the beautiful Kulu valley to Larji (3000
feet). It has at first a rapid course, but before it reaches Sultanpur
(4000 feet), the chief village in Kulu, some thirty miles from the
source, it has become, at least in the cold weather, a comparatively
peaceful stream fringed with alder thickets. Heavy floods, however,
sometimes cover fields and orchards with sand and boulders. There is a
bridge at Manali (6100 feet), a very lovely spot, another below Nagar,
and a third at Larji. Near Larji the river turns to the west down a bold
ravine and becomes for a time the boundary between Kulu and the Mandi
State. Near the town of Mandi, where it is bridged, it bends again, and
winds in a north-west and westerly direction through low hills in the
south of Kangra till it meets the Siwaliks on the Hoshyarpur border. In
this re