On Yuan Chwang's Travels in India, 629–645 A.D. v1.c8.s1.13

v1.c8.s1.13

The name Hsien-tou was apparently applied to a region different from that designated Shên-tu.³ Like Hsien-tu (縣度), of which term it is perhaps only a variety, this name was probably used first by the Chinese for the Indus, called Sindhu in Sanskrit. The name was afterwards extended by them to a mountainous region, perhaps Ladak, through which the Indus flows. We find the Hsien-tu country mentioned in the same passages of the Han History with Shên-tu.