The Course: Beach Boulevards With a Sting in the Tail
For years the half marathon has been marketed as a beach run, and in large part it is — earlier editions sent runners along more than 13km along the pristine beach of white sand and a long line of pine trees before turning inland toward the city centre [6]. Runners who've done it describe the terrain as anything but flat, with rolling sections that catch newcomers off guard.
In 2026 organisers reworked the route again, and the change is significant enough that it's worth knowing before you sign up. The banner 21km race now starts at Ochheuteal Beach, proceeds to Otres, then turns toward Deum Chheam Sneha, before looping around the Preah Thong–Neang Neak statue and returning along the same coastal road to finish at Ochheuteal Beach [4]. That's a deliberate shift toward more shoreline and less city grind — the 10km, 5km and 3km fun run events also take place along the coastal area [4].
Even with the reroute, don't expect pancake-flat splits. One finisher's account of an earlier course flagged a 'dramatic' U-turn on a hill, with some authorities greeting the runners — a memorable moment, but also a reminder that the terrain has teeth [5].
Conditions and Timing
Cambodia's coast is tropical, and organisers clearly plan around that: the half marathon has historically gone off at first light, with all four races beginning at 5.30am on Ochheuteal Beach in one recent edition [3], and the 21km race starting at 5:10 am, followed by the other categories in another [2]. The early gun is your best defence against the heat that builds through the morning on an open, largely unshaded coastal road.
Organisation and Logistics
The event is run under the banner of four distances rather than one headline race. The event includes four race categories that cater to a wide range of participants, from professional athletes to recreational runners: 21km, 10km, 5km and 3km [2]. For 2027 the mid-distance is listed at 10.5km rather than a flat 10km, so double-check your category on the official Cambodia Events page rather than assuming last year's numbers carry over exactly [1].
Finish-line process is straightforward and low-frills: upon arriving at the finish line, event staff check the bib number and offer finisher medals to all finishers of the Half Marathon (21km), 10km, 5km and 3km races [1]. It's not a race with elaborate expo culture or gadget-laden timing gimmicks — this is a community event with a charity backbone, not a boutique big-city production.
One consistent gripe from past finishers is course communication. A reviewer on Ahotu noted that the map of the organisation could use some improvement to show the hills, but nothing that would change their mind about the race [5]. Go in expecting a course briefing that's a little light on elevation detail, and you won't be caught out.
Atmosphere and the Field
This is not a race that drowns you in crowds. In the words of one runner reviewing the half marathon: 'The Half marathon was a great surprise. No crowded at all and good ambiance.' [5] That's an accurate summary of the vibe — friendly, unhurried, with room to run your own race rather than jostle for position.
Numbers have grown steadily rather than exploded. The ninth edition came off successfully, with 1,500 participants from 35 countries taking part, up from 1,200 participants the year before [3]. But the international contingent remains a minority slice of the field — the majority of runners were locals, with roughly 300 travelling from other nations around the world [3]. Expect a genuinely local, community feel rather than a big overseas running-tourism circus.
Organisers are betting on the coastline itself to grow the event's profile. Executive director Sem Phalla told press ahead of the 2026 route change that the province's coastal zones are now well-developed, with asphalt and concrete roads that are highly suitable for running [4]. It's a fair pitch — the beachfront setting is the race's biggest selling point, route quirks aside.
Should You Run It?
If you're chasing a fast, chip-timed PB course with slick expo energy, look elsewhere — this race is rolling, occasionally under-signed on elevation, and modest in scale. But if you want a legitimate reason to spend a long weekend on one of Cambodia's best-known beaches, run alongside a mostly local field with a warm, unpretentious atmosphere, and support a cause tied to environmental protection and support for landmine victims, the Sihanoukville International Half Marathon delivers exactly that. The 2026 route overhaul toward more coastline is a promising sign for the 12th edition — just train on some hills first, and treat your finish time as a bonus rather than the point.