Ruins of Desert Cathay 297 - Ruined fort and watch-tower on Mazar-tagh ridge seen from west. Belowk, in background, wide flood-bed of the Khotan river. Stein visited this isolated Tibetan fort several times - other photos and diagrams are in his other reports. It was located on the only prominent ridge above the Khotan river and about half way across the desert - an excellent location for a guard post.