Archaeologists have discovered a possible canal which links the Kulen mountains to Angkor, thus providing a ‘highway’ from which to transport the sandstone that was used to construct the temples.
Building blocks of Angkor Wat were shipped in by canal
New Scientist, 20 October 2012
Quarries and transportation routes of Angkor monument sandstone blocks
Journal of Archaeological Science, http://dx.doi.org/10.1016/j.jas.2012.09.036