Sihanoukville to Kampong Chhnang Drive: Best Stops & Tips

Leaving Sihanoukville, you'll notice the national road 4 (NR4) quickly sheds the coastal humidity, transitioning into a drier corridor flanked by cashew orchards. This isn't your typical beach-to-river trip—it's a journey that traces Cambodia's modern paving over old French colonial tracks. The route covers 196 kilometers, but the real distance is in the stops and stories along the way.

Safety on the road is improving, but vigilance is key. During rainy season (June–October), the stretch near Oudong becomes slippery—reduce speed by 20 km/h. Also, be wary of livestock crossings, especially at dawn and dusk. A drive that is well-paced includes two major breaks: one at Kirirom (or nearby) and another at Kampong Tralach. These towns have basic clinics and wide shoulders for emergency stops.

For families, the route is kid-friendly, with several parks and rest areas. The Win Win Cooperation Memorial in Sihanoukville is a good starting point for a history lesson. Pet owners should note that many guesthouses in Kampong Tralach accept dogs, but it's wise to call ahead. And if the journey feels long, use the table below to plan your pit stops—remember to stretch every 90 minutes.

To maximize enjoyment, stop by the how to find the best stops and hidden gems between cities guide for GPS-friendly tips.

As you climb toward the Elephant Mountains, pine forests replace tropical foliage—a rare ecosystem in Cambodia. The Kiriom National Park, at 675 meters, offers a quick viewpoint, but don't stop if you're short on time; the real gem is the smaller, unmarked trail at kilometer 56, known for its cascading waterfall. This hidden spot is a perfect picnic break.

Beyond wildlife, roadside commerce thrives: from Sihanoukville to Kampong Tralach, you'll see stalls selling fresh coconuts and grilled squid, but as you move inland, the fare shifts to palm sugar and rice wine. In Kampong Tralach, the local market is a sensory overload of Khmer sweets and simmering noodle soups—an ideal place to taste authentic regional flavors.

This route also passes near the Phnom Udong historical park, which, while not a UNESCO World Heritage Site, houses former royal stupas. If you're a history buff, a 40-minute detour to the summit rewards you with sweeping views of the surrounding plains.

Planning your fuel budget is straightforward: the drive consumes roughly 15 liters in a standard sedan, with diesel stations clustered at Sihanoukville, Pey Sar, and Kampong Tralach. Gas prices average 4,200 riel per liter. The road is mostly two-lane asphalt; expect smooth pavement until Kirirom, then after Kampong Tralach, watch for potholes.

• NR4 (Sihanoukville to Pey Sar) is recently repaved and well-marked.
• After Pey Sar, sections near Oudong have ongoing construction, reducing lanes to one.
• Total crossing time: approximately 3.5 hours without stops.

For the best experience, depart early morning to avoid the 11 AM heat haze that shimmers over the later stretches.