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River Kwai International Half Marathon

Quick facts

Location Tha Sao, Thailand

Distance Marathon

About River Kwai International Half Marathon

The River Kwai Half Marathon is the oldest road race in Thailand, organized by Amazing Field. The course is one of the most scenic in Thailand. There is also a Mini Marathon (10K)  and an Ultra Half Marathon (39K).

New for 2020 is the marathon distance.


Ultra Half Marathon

  • 38km

Half Marathon

  • 21.098km

Quarter Marathon

  • 10km


  • 42.195km

Mini Marathon

  • 10km


Age Limit

42K, 38K - 18; 21K - 16; 10K - 12

Award Medals

Commemorative Medal

Maximum Time

42K, 38K - 6h30 , 21K - 4h, 10K - 2h30

Race Kit Includes

Timing chip, Running singlet, Commemorative medal, Breakfast buffet


Chip timing


front of River Kwai Village Hotel

74/12 หมู่ 4 Tha Sao, Sai Yok District, Kanchanaburi 71150, Thailand


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

The race information has been found on the official website of the event or through publicly available sources. Always refer to the official website the latest race information. Please let us know if any data is wrong or missing, by emailing us.