Kampong Cham to Koh Kong: Road Trip Guide

Spanning roughly 350 kilometers, the drive from Kampong Cham to Koh Kong cuts across central Cambodia before snaking through the Cardamom Mountains. You'll trace National Road 6 west to Phnom Penh, then follow National Road 4 to Sihanoukville, and finally take National Road 48 into Koh Kong. The full journey typically takes 6 to 8 hours, depending on traffic and stops. This route's significance dates to the French colonial era, when roads were first carved through these dense forests to connect the Mekong basin to the Gulf of Thailand.

Road quality varies: NR6 and NR4 are well-paved, but NR48 has sharp curves and occasional potholes—drive cautiously, especially in rain. Families will find clean restrooms at major petrol stations; children enjoy the monkey forest near Sihanoukville and the bamboo bridge at Kampong Cham, a seasonal crossing rebuilt yearly. Pet-friendly travelers should note that few hotels near Koh Kong allow pets, but guesthouses in Kampong Cham are more accommodating.

To manage fatigue, schedule breaks every 2 hours; good rest zones include Skun, famous for fried spiders, and the Sre Ambel market. Hidden off-route spots include the abandoned French church at Kampong Cham and the secret waterfalls at Tatai, a short detour before Koh Kong. For more tips on finding unique stops, check this guide: how to find the best stops and hidden gems between cities.

As you leave Kampong Cham, you'll pass rubber plantations and rice paddies before reaching the bustling capital. Beyond Phnom Penh, the road to Sihanoukville cuts through flat farmland, then climbs into the Cardamom Mountains—Cambodia's largest rainforest, home to waterfalls and wildlife. The region's climate is tropical monsoon, with a dry season from November to April when travel is most pleasant.

Local commerce thrives along the route: roadside stalls sell fresh fruits, and small restaurants offer Cambodian street food. One notable UNESCO World Heritage Site lies slightly off-track—the temple complex of Preah Vihear is far north, but easily addable with a detour. For culinary infrastructure, expect grilled meats, noodle soups, and fresh coffee at every town.

Fuel stations are plentiful along National Road 4, but once you turn onto the winding National Road 48, they become sparse—plan to fill up in Sihanoukville. As of 2025, fuel prices hover around 4,100 riel per liter for regular gasoline. Toll fees apply on some expressway sections near Phnom Penh; the entire route may cost about 20,000 riel in total tolls.

• Major highways: NR6, NR4, NR48
• Driving time: 6-8 hours (nonstop)
• Best fuel stop: Sihanoukville (last reliable station before Koh Kong)