Péngzhōu

Pengzhou lies where the northwestern edge of the Chengdu Plain meets the mountains. Its name was associated with Tianpeng Gate, the paired mountains at a river's emergence from the Min range. The Tang established the prefecture in 686; the early Ming reduced it to Peng County in 1377. Water from the Jian River supplied irrigation works in the district. A surviving agreement of 1746 records the division of water between weirs, testimony to the shared management needed to keep the channels serving the fields.