Sihanoukville to Kampong Thom: Road Trip Guide

The Sihanoukville–Kampong Thom route is a 300-kilometer journey that crosses the Cardamom Mountains foothills and the Tonlé Sap floodplain. Known locally as National Road 4 and 6, the drive typically takes 4 to 5 hours without stops. The road was upgraded in the 2010s, but you'll still share it with trucks, buses, and motorcycles, so plan for patience.

For a comprehensive approach to discovering worthwhile detours, refer to how to find the best stops and hidden gems between cities. Below, we break down the journey by logistics, landscapes, safety, and hidden spots, ensuring you don't miss the best stops Sihanoukville to Kampong Thom offers.

For infrastructure safety, the roads are relatively well-maintained but lack safety barriers in rural sections. Stop at the designated rest areas, like the one at Thnu village (Km 120), which have clean restrooms and basic food stalls. If you're traveling with children, the Skuon tarantula stalls are an attraction, but also consider the Prek Koy Sandy Beach on the coastline before Sihanoukville – though it’s technically a pre-start stop, it’s a short detour.

For pet-friendly frameworks, many roadside restaurants allow pets on outdoor terraces, but carry water and be mindful of heat. In Kampong Thom, the Bamboo Restaurant welcomes dogs. The climate is tropical, with a hot wet season and a cooler dry season, so time your drive in the morning to avoid heat and afternoon rain. Fatigue management is key: avoid driving the entire stretch in one go; set a timer to stop every two hours, and use the upcoming ‘things to do between Sihanoukville and Kampong Thom’ list to plan breaks.

The landscape shifts from coastal palm trees to rubber plantations, then into rice paddies as you approach the Tonlé Sap. The Cardamom foothills on your west are a backdrop of dense forest, home to wildlife like Asian elephants. Near Skuon, the road is famous for its deep-fried tarantula stalls, a true local commerce highlight. These vendors have been serving the delicacy for decades, attracting curious travelers.

UNESCO World Heritage Sites aren't on this route directly, but Kampong Thom is a gateway to the nearby temple ruins of Prasat Sambor Prei Kuk, a UNESCO site just 25 km east of town. This means is it worth driving Sihanoukville to Kampong Thom? Absolutely, if you’re interested in pre-Angkorian history. Along the way, consider a detour through the village of Phnom Sruoch, where you can see traditional silk weaving.

Before setting out, check your vehicle: the route includes stretches of single-lane road with occasional potholes after rain. Fuel stations are frequent near Sihanoukville and Kampong Thom but sparse between Kampong Speu and the halfway point. Fill up at Kraing Chek (about 90 km from Sihanoukville) to avoid range anxiety. For answers to 'how long to drive Sihanoukville to Kampong Thom', expect 4–5 hours of actual driving, plus stop time.

• Tolls: NR4 has a toll booth near Sihanoukville (5,000 riel for cars).
• No tolls on NR6 between Skuon and Kampong Thom.
• Road conditions: good in dry season, slippery when wet.