Cao Lanh to Kampong Thom: Road Trip Guide

The route from Cao Lanh to Kampong Thom crosses the Mekong Delta's southern tip and the Cambodian plain, a distance of roughly 340 kilometers that typically takes 7-8 hours by car including border formalities. This corridor follows National Road 1 (QL1) through Vietnam to the Moc Bai border crossing and then Cambodian National Road 1 (NR1) to Phnom Penh before switching to NR5 and NR6 toward Kampong Thom.

The border area is known for its dense cashew orchards and rubber plantations, while the stretch after Phnom Penh reveals ancient temples and freshwater fisheries. Driving here offers a tangible sense of the Mekong's influence, from the flat fertile fields to the Tonle Sap's seasonal pulse.

Driving safety is generally acceptable, but be cautious of overtaking trucks, stray livestock, and motorbikes. In Cambodia, drive on the right; the expressway has a speed limit of 120 km/h, while QL1 is 80 km/h. Rest areas are sparse, so plan to stop at towns like Neak Loeung (ferry crossing over the Mekong) or Skun (famous for fried spiders) for a stretch.

For families, the route offers child-friendly stops: in Cao Lanh, visit the Xeo Quyt forest with its wartime bunkers (entrance 50,000 VND, about $2), and in Kampong Thom, the Sambor Prei Kuk temples are a safe area for kids to run around. Pet-friendly travel is possible, but keep in mind that many restaurants and temples do not allow pets; always check ahead.

Fatigue management is crucial: drive no more than 2 hours at a stretch. The best places to rest are at the border (Bavet has several coffee shops), and after Phnom Penh, the expressway's rest stops provide clean toilets and snacks. For deeper breaks, consider the town of Kampong Cham, which is on the way if you take NR7, offering a scenic riverfront and the famous bamboo bridge.

Leaving Cao Lanh, the landscape is a mosaic of rice paddies and fish farms, a result of the Mekong's annual floods. As you approach the border, the terrain becomes drier with scattered deciduous forests. After Phnom Penh, the road skirts the northern edge of the Tonle Sap floodplain, where during wet season (May-October) you'll see floating villages and stilt houses.

Commerce along the route is lively: roadside stalls sell fresh fruit, sugarcane juice, and fried insects in Cambodia. In Vietnam, you'll find coffee shops and pho stands. A notable stop is the town of Svay Rieng, where you can sample local noodle soup and buy handwoven krama scarves. The market in Kampong Thom, near the Sambor Prei Kuk temple complex, offers genuine Cambodian crafts and dried fish.

Near Kampong Thom, the pre-Angkorian temple complex of Sambor Prei Kuk, a UNESCO World Heritage Site, is a must-see. It dates back to the 7th century and features octagonal towers that are unique in the region. The entrance fee is $10, and it's a short detour from the main road.

Fuel is readily available along the entire route, with stations every 20-30 kilometers in Vietnamese territory and similarly spaced on Cambodian roads. As of early 2025, gasoline in Vietnam costs around 24,000 VND per liter (approx. $1), while in Cambodia it's about 4,100 KHR (approx. $1). Plan for a total fuel expense of roughly $25-30, depending on your vehicle's efficiency.

The road quality varies: QL1 is well-paved but narrow in places, while NR5 from Phnom Penh to Kampong Thom is a new expressway with smooth asphalt and clear signage, but with limited service areas. Border crossing at Moc Bai/Bavet can take 30-60 minutes; ensure you have valid vehicle paperwork. Tolls apply on Cambodian highways: the Phnom Penh to Kampong Thom expressway costs about $4 for a car.

• Vietnamese roads: QL1 from Cao Lanh to Moc Bai, 180 km, good condition.
• Cambodian roads: NR1 to Phnom Penh, 130 km, then NR5/NR6 to Kampong Thom, 160 km, with expressway sections.
• Currency exchange: US dollars are widely accepted in Cambodia; Vietnamese dong only in Vietnam.