Héngduànshān

The Hengduan ranges around Dechang enclosed the lower reaches of the Anning River plain in southwestern Sichuan. Here a relatively broad cultivated valley narrowed towards the mountains and the river's descent to the Yalong. Routes following the Anning linked the Jianchang country around Xichang with Huili and Yunnan, while journeys across the ridges led into quite different river systems and communities.

Under the Yuan, Dechang belonged to the administrative world of the Luoluo frontier. Ming government combined military establishments in the valleys with hereditary native authorities in the surrounding country. These arrangements brought officials and soldiers into continuing negotiation and conflict with Yi leaders, whose power could not be measured simply by the boundaries claimed on an imperial map. The campaigns described in the Ming history show mountain strongholds and alliances between local chiefs shaping the movement of armies. In the Qing period, gazetteers still described Dechang through its mountain frontiers and neighbouring jurisdictions. The valley offered a corridor for government and exchange, but the adjoining heights retained a more fragmented landscape of settlement, authority and passage.