Samut Prakan to Kampong Thom: A Road Trip Guide

The drive from Samut Prakan, Thailand's coastal industrial hub, to Kampong Thom, a Cambodian province known for its ancient temples, crosses two countries and about 620 kilometers of changing landscapes. This route follows the Asian Highway 123 (AH123) through the Thai border at Aranyaprathet and into Cambodia via Poipet, passing through flat agricultural plains and the edge of the Tonlé Sap basin.

For a road trip that balances culture and convenience, this guide covers everything from border crossing tips to family-friendly stops. Whether you're a seasoned overlander or a first-time cross-border driver, knowing what to expect can make the journey smoother.

The route transitions from Thailand's central plains, dotted with rice paddies and sugar palm trees, to Cambodia's Western Tonlé Sap basin, a flat lowland prone to seasonal flooding. Near Kampong Thom, the landscape is home to the pre-Angkorian archaeological site of Sambor Prei Kuk, a UNESCO World Heritage Site known for its brick temples dating from the 7th century.

Along the way, you'll find local markets selling tropical fruits, Cambodian silk, and handicrafts. In Sisophon, a bustling market town, stop for a meal of amok or lok lak, local Cambodian dishes. Hidden off-Route spots include the ancient temple of Prasat Bakan in the forest east of Kampong Thom, rarely visited by tourists.

For a deeper dive into how to discover such hidden gems, check out how to find the best stops and hidden gems between cities.

Road conditions are generally good in Thailand, but in Cambodia, watch for overtaking buses, livestock, and motorbikes. Drive defensively and keep a safe following distance. In rural areas, unlit sections and unexpected pedestrians add risk; avoid driving after dark.

For families, the route offers kid-friendly stops like the Samut Prakan Crocodile Farm. In contrast, Cambodia's stops are more rustic; bring your own car seat. Pet-friendly accommodations are rare, so plan ahead if traveling with animals; many guesthouses may accept pets but confirm in advance.

To manage fatigue, consider breaking the journey at the town of Serei Saophoan (Sisophon) or Battambang, though the latter is a detour. Rest stops are limited on Cambodian highways; use fuel stations as break points. Locate a 24-hour gas station near Poipet for a restroom break and coffee.

How long to drive Samut Prakan to Kampong Thom? The actual driving time is roughly 9–10 hours, but border procedures at Poipet/Aranyaprathet can add 1–3 hours depending on traffic and processing. It's wise to start early to avoid long queues at the border crossing.

• Thai side: Use Route 33 from Sa Kaeo to Aranyaprathet, a four-lane highway in good condition.
• Cambodian side: National Road 5 from Poipet to Sisophon, then National Road 6 to Kampong Thom, both paved but with varying quality.
• Border Crossing: Aranyaprathet–Poipet is open 24/7. Have your passport, vehicle registration, and insurance ready.

Fuel stations are frequent on the Thai side, less so in Cambodia, especially between cities. Plan to fill up in Aranyaprathet or Poipet. In Cambodia, unearthed roads can have potholes, so drive cautiously.