Angkor hydraulic system and medieval droughts

Record summary

Angkor’s reservoirs, canals, embankments and urban infrastructure form one of the largest archaeological water-management landscapes in the world. Tree-ring studies and hydraulic mapping have identified prolonged droughts interrupted by intense monsoon floods during the later medieval period. The case matters for comparing climate stress, infrastructure fragility, migration and political reorganization. Researchers debate how directly hydrological instability contributed to Angkor’s transformation, since warfare, trade shifts, disease, religious change and regional political dynamics also mattered. The city did not simply vanish overnight.