The city of Angkor and its environs, which once held more than 60 temples and a million residents, dates between the 9th and 15th centuries AD. This major Khmer site was organized around several vast reservoirs (large dark rectangles, numbered 3, 4, and 6), interconnected by canals used for transportation and irrigation throughout the central zone. The main temple complexes, including Angkor Wat (2), the larger Angkor Thom (1), and Preah Khan (5) are now mainly covered by rainforest, making visual air surveys difficult. Aided by new radar satellite imagery, however, areas both at Kalipura near Angkor Wat and north of Angkor Thom are revealing previously unknown structures and canals.
[Fig.1: SIR-C image of the center of Angkor (NASA-JPL P-45156 ).]
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