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China National Highway 317
China
National Highway 317
runs
broadly
west
to
east
from
Chengdu, Sichuan
to
Naqu
,
Tibet
. It is 2,028 kilometres in
length
. As of 2017,
Highway 317
passes
through the
highest
vehicular tunnel
in
the world
in the
Chola Mountains
of
Dêgê County
.
Route
and
distance
