River Kwai International Half Marathon

21.100 km and 10.550 km out and back scenic course on the road (asphalt) No. 323. This course was verified and sanctioned by Association of International Marathons and Road Race (AIMS). The out and back course is one of the most scenic in Thailand. It takes runners up a gradual climb to the turn around point at 10.5 km. The declining return leg to the finish line will make for a fast second half of the race and most runners normally post a negative split at this race. There is also a 10K Run on offer which uses the same course with an earlier turn around point. Entries are limited to 1,500 runners and the race has sold out in previous yea