Two Han passes on the western routes

Dunhuang became a Han commandery in 111 BCE, during Emperor Wu’s reign. Yumen Pass and Yangguan belong to the frontier landscape established around this oasis, though their remains are spread across a broad gravel plain rather than concentrated in one walled complex. Local heritage materials describe Yumen to the north and Yangguan to the south. Rammed-earth walls and beacon mounds made a sparse but legible system of gates and signals along routes leading farther west.

The site commonly identified as Yumen Pass includes Xiaofangpan, a small square fort, and the Hecang granary, a larger storage compound. The remains sit among Han wall sections and beacon mounds. UNESCO’s Silk Roads property names the Site of Yumen Pass as one component of the Chang’an–Tianshan Corridor, inscribed in 2014. The listing describes a transcontinental network rather than a single road or building. At Xiaofangpan, the surviving earth and the open terrain help explain the practical scale of frontier infrastructure: a compact fortified point linked to storage and signals.

Yangguan marks the southern approach and has its own archaeological landscape. Local site materials describe the Gudongtan area, a beacon mound, remains associated with Shouchang city and a Han-period pond known as Wowa. A museum presents objects connected with the region’s military, trade and daily life. The place is also preserved in language: “Yangguan avenue” became a familiar expression for a road opening ahead. The two passes belong to one broad frontier story, but each has its own remains and setting. A visit to Yangguan is therefore a walk through a southern landscape of traces, not simply an extension of the northern fort.