Figure 1 | Scientific Reports

Figure 1

From: Ancient Great Wall building materials reveal environmental changes associated with oases in northwestern China

Figure 1The alternative text for this image may have been generated using AI.

Location of the study area in northwestern China. (a) Extent of Qin and Han Great Wall segments across northern China. (b) Site locations in Gansu and Xinjiang: (1) Han Dynasty Great Wall segment; (2) Beacon tower near Site 1; (3) Beacon tower near Guazhou town; (4) Xijiandun Beacon Tower; (5) Cang Ting Sui Beacon Tower at Yumenguan; (6) Great Wall Heritage Site; (7) Majuanwan Great Wall segments; (8) Milan Castle Heritage Site; (9) Buddha Tower, south end of the Yingpan City Heritage Site; (10) City wall, north end of the Yingpan City Heritage Site; (11) Yakelun Beacon Tower; (12) Sunji Beacon Tower; (13) Tahaqi Beacon Tower; (14) Sishilidadun Beacon Tower. Circles date to the Han Dynasty, hexagons to the Jin Dynasty, squares to the Tang Dynasty, and triangles to the Song Dynasty. Maps were created using ArcGIS Pro desktop GIS software developed by Esri.

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