River Kwai International Half Marathon

The River Kwai Half Marathon is the oldest road race in Thailand.

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.