This paper reports the first chronometric study of the 'moats' of the abund
ant mounded Iron Age sites of northeast Thailand. Here AMS C-14 dates and T
L dates are reported which indicate that the moats date from a short period
in the Mid to Late Iron Age, before being infilled. The dates also contain
preliminary evidence for the chronology of landscape change, which is crit
ical to the understanding of the Iron Age occupation of this region.