Introduction: From Port to River
The drive from Sihanoukville to Suong covers roughly 370 kilometers, tracing National Road 4 northeast before joining National Road 1 at Phnom Penh. This route links Cambodia's busiest port city with a provincial town on the Mekong's banks—a journey that transitions from tropical coast to fertile plains.
Expect about 6–7 hours of driving time, depending on traffic and stops. The road is paved for the entire stretch, but conditions vary: the first segment on NR4 is a modern expressway-style highway, while the latter part on NR1 features two lanes and occasional potholes, especially near Suong.
| Route Segment | Distance | Typical Time |
|---|---|---|
| Sihanoukville to Phnom Penh | 230 km | 4–5 hours |
| Phnom Penh to Suong | 140 km | 2–2.5 hours |
Route Logistics and Infrastructure
Fuel and Route Economics
Fuel stations are abundant along NR4, with major brands like Caltex and Total operating 24/7. On NR1, stations are sparser but still frequent, especially near Neak Loeung. As of 2025, gasoline costs around 4,000 riel per liter. It's advisable to fill up in Phnom Penh before the final leg, as prices may be slightly higher in rural areas.
Tolls apply on the Phnom Penh–Sihanoukville Expressway: about $5 for a standard car. No tolls are on NR1 itself.
The Surface and Signage
NR4 is a four-lane divided highway with clear signage in Khmer and English. NR1 narrows to two lanes after Phnom Penh, and signage becomes less frequent; watch for turns to Suong, which is just off the main road on Route 308. Frequent speed cameras and police checkpoints add to the need for strict adherence to speed limits (90 km/h on NR4, 60–70 km/h on NR1).
Best Drive Time
The best stops Sihanoukville to Suong are best experienced during the dry season (November to April). The rainy season (May to October) brings heavy downpours that can flood low-lying sections of NR1, especially near the Mekong.
Natural Landscapes and Local Commerce
Scenery and Geology
The first 50 kilometers from Sihanoukville are hilly, with dense tropical forest and occasional glimpses of the sea. Approaching Phnom Penh, the land flattens into rice paddies and palm groves. After crossing the Mekong at Neak Loeung via the Japanese-built bridge, the landscape becomes pastureland and orchards, with the distinct red soil of Prey Veng province.
Hidden Off-Route Spots
Just 20 kilometers before Suong, a dirt road leads east to the town of Kampong Meas, where you'll find the serene Preah Theat Teuk Chhouk, a hilltop pagoda overlooking the Mekong. Many travelers miss it, but it offers a peaceful break from the highway.
Near Sihanoukville, the coastal village of Otres is worth a detour for its quiet beach and relaxed vibe, a contrast to the bustling port area.
Local Commerce and Culture
Roadside markets sell local snacks like grilled skewers and tropical fruits. In Suong, the central market is a hub for trading dried fish and rice, reflecting the town's river economy. Traditional weaving is practiced in nearby villages, though it's not heavily commercialized.
For more tips on unearthing local gems, see how to find the best stops and hidden gems between cities.
Road Safety, Family Stops, and Fatigue Management
Infrastructure Safety
Road quality is decent overall, but flooded roads during the monsoon demand caution. Street lighting is scarce outside Phnom Penh, so avoid driving after dark. The stretch between Sihanoukville and Kampot is known for higher crash rates due to speeding; use the designated overtaking lanes.
Rest Stops and Fatigue
Plan a break every 2 hours. The midway point at Kirirom National Park offers a scenic rest stop with picnic facilities. In Phnom Penh, the Aeon Mall parking area is a safe spot to stretch, but for a quicker pause, the Total station at the NR4 exit provides clean restrooms and coffee.
Family and Pet-Friendly Stops
Families will appreciate the playground at the Kirirom rest stop, where kids can run under pine trees. For pets, most rest stops allow dogs, but keep them leashed. There are no dedicated dog parks, and the rural areas have stray dogs, so use caution.
When it comes to dining, local noodle shops and French-inspired bakeries are common along NR4. Near Suong, try the riverfront restaurants serving Mekong fish—a safe bet for families with simple tastes.
Continue Your Adventure
Frequently Asked Questions
How long to drive Sihanoukville to Suong?
The drive covers about 370 km and typically takes 6–7 hours without overnight stops, depending on traffic and break time.
Is it worth driving Sihanoukville to Suong?
Yes, if you want to see Cambodia's diverse landscapes and avoid a crowded bus; the road is in fair condition, and you can stop at Kirirom National Park or the Mekong side.
What are some things to do between Sihanoukville and Suong?
Visit Otres beach near Sihanoukville, Kirirom National Park for hiking, Phnom Penh's royal palace, and the hilltop pagoda at Kampong Meas.
What is the route's relation to UNESCO World Heritage Sites?
The route itself doesn't pass through any UNESCO sites, but it's a gateway to the Temple of Preah Vihear, which is a UNESCO site, though it's far off this route.
Your voluntary support keeps the project running and fuels our future development
