Koh Rong to Kampong Thom: Driving Guide

The direct route from Koh Rong to Kampong Thom spans approximately 300 kilometers, with the drive taking 5 to 6 hours excluding ferry time. The journey starts with a ferry from Koh Rong to Sihanoukville, then follows National Road 4 (NR4) to Phnom Penh, and finally National Road 6 (NR6) north to Kampong Thom. The bridge across the Stung Sen River at Kampong Thom, completed in 2002, is a notable landmark.

Driving this route offers a blend of coastal and inland landscapes. The first leg from Sihanoukville to Phnom Penh is a well-paved highway, while the final stretch on NR6 passes through rural countryside. For planning, consider that the total cost for a private car includes fuel (approximately $30), ferry tickets ($20), and road tolls ($5).

Fuel stations are plentiful along NR4 and NR6, with frequent stops every 20-30 kilometers. Diesel prices average $1.05 per liter, while gasoline is slightly higher. For budget planning, a typical car consumes about 8 liters per 100 kilometers, making the fuel cost for the land portion around $25.

• Ferry services run hourly from Koh Rong to Sihanoukville, with the first departure at 7:30 AM and the last at 5:00 PM.
• Road tolls on NR4 amount to $3, and on NR6 to $2. Tolls are payable in cash or via ETC card.
• Rest areas with clean restrooms exist at major service stations such as Sokimex in Sihanoukville and Caltex in Kampong Thom.

The route is well-maintained, though NR6 has some narrow sections near Kampong Thom due to ongoing upgrades. The Phnom Penh city crossing adds an extra 30 minutes during peak hours. For detailed guidance on finding hidden gems, check this resource: how to find the best stops and hidden gems between cities.

Road conditions on NR4 are excellent, but watch for speeding trucks and sudden water buffalo crossings. On NR6, mind the unpaved shoulders and occasional potholes. Both roads have streetlights only in urban sections, so night driving is discouraged. The speed limit is 90 km/h on highways and 40 km/h through towns.

For families, both Koh Rong and Kampong Thom offer kid-friendly activities. On Koh Rong, the Long Set Beach has gentle waves, while Kampong Thom’s Sambor Prei Kuk temple area has a children’s playground. The journey is quite family-friendly, but rest stops with playgrounds are sparse; plan for picnic breaks at scenic spots.

Pet-friendly options are limited. Many hotels on Koh Rong and in Kampong Thom allow pets, but restaurants generally do not. Fuel stations and rest areas are pet-friendly, but keep your pet on a leash. For fatigue management, the recommended rest zones are the Sihanoukville service area (km 210) and the Kampong Speu rest stop (km 120), each with shaded parking.

• Take a break every two hours to avoid fatigue.
• The Kampong Speu rest stop offers a garden and coffee stalls.
• Avoid driving between 2 AM and 5 AM due to low visibility and tired truck drivers.

The coastal stretch between Sihanoukville and Kampong Speu showcases the Cardamom Mountains on the horizon, but the real highlight is the Prek Thnot River near Kampong Speu. This area is a popular stop for boating and birdwatching. Further inland, the landscape transitions to rice paddies and sugar palm trees, iconic in Kampong Thom.

Local commerce thrives along the route, especially at the central markets in Kampong Speu and Kampong Thom. These markets sell fresh produce, traditional sweets, and handwoven krama scarves. For a side trip, the Koh Ker temple complex, a UNESCO World Heritage Site, is a 45-minute drive east of Kampong Thom, offering a less crowded alternative to Angkor.

• Koh Ker was the capital of the Khmer Empire in the 10th century and features the Prasat Thom pyramid.
• The best time to stop at these markets is in the morning before 10 AM when vendors are most active.
• Local diners along NR6 serve amok, a coconut milk fish curry, and Nhoam, a fresh spring roll.