Phitsanulok to Kampong Chhnang: A Road Trip Guide

Phitsanulok, a Thai city on the Nan River, sits 337 kilometers north of Bangkok. Kampong Chhnang, Cambodia, is a province on the Tonlé Sap River, about 91 kilometers north of Phnom Penh. The overland route between them covers nearly 800 kilometers and involves a border crossing at Chong Sa-ngam (Thailand) / O Smach (Cambodia). The most efficient path uses Thailand's Highway 12 (AH16) eastward to the border, then Cambodia's National Road 68 and 6 southward to Kampong Chhnang. Driving time typically ranges from 11 to 14 hours, excluding border formalities, depending on road conditions and traffic.

One notable fact: Highway 12 cuts through the Phetchabun Mountains, where the terrain includes the second-highest peak in Thailand, Phu Thap Boek (1,794 meters). This range is part of the Luang Prabang mountain chain, which extends into Laos. The route's geological variety—from alluvial plains to karst foothills—makes it a scenic but demanding drive. Planning ahead for border crossing hours (8 AM–6 PM both sides) is essential.

The route scores moderately on safety. Thai roads are well-lit and marked; Cambodian roads have potholes and occasional livestock crossings. Drive with headlights on in Cambodia (a legal requirement). Emergency numbers differ: dial 1669 for ambulance in Thailand, 117 for police in Cambodia.

Is it worth driving Phitsanulok to Kampong Chhnang? For travelers eager to experience two cultures and landscapes, the drive offers a unique cross-border adventure that flights can't provide. However, it's not a quick hop; plan for a full day of driving.

Family and child suitability: The route includes several rest areas with playgrounds in Thailand (e.g., at Sikhio or Wang Sapung, just off Highway 12). In Cambodia, stops are more basic; pack snacks and entertainment. Children over 5 will likely enjoy the novelty of border crossing stamp collecting.

• Pet-friendly: Many hotels along the route accept pets (check ahead), and roads are generally pet-friendly, but no dedicated rest stops for pets; carry water and a leash.
• Fuel and rest: Advisable to fill up before crossing the border, as O Smach's fuel stations are fewer. Plan stops every 2 hours for fatigue management; designated rest areas in Thailand, such as at Thung Saliam Luang (Km. 88 from Phitsanulok), are ideal.

Hidden off-route spots: About 10 km south of Phitsanulok lies Wat Yai Tha Luang, a temple with a giant reclining Buddha, but it's bypassed by most. On the Cambodian side, the Anlong Veng Historical Park (off Highway 68) contains Pol Pot's grave and is a somber yet informative detour.

Culinary infrastructure: Expect Thai restaurants serving noodles and som tam along Highway 12, while in Cambodia, roadside stalls sell Khmer noodles and grilled chicken. Notable stop: the night market in Phitsanulok (on Atsadang Road) for its roast duck, and in Kampong Chhnang, the riverfront has stalls for amok trey (fish curry in banana leaf).

For more insights into uncovering hidden gems, see how to find the best stops and hidden gems between cities.

The route passes through varied landscapes: the sunflower fields of Phitsanulok (November–January) give way to the forested mountains of the Phetchabun Range, with viewpoints like Khao Kho offering panoramic views. As you enter Cambodia, the Dangrek Mountains form a natural border, then flat plains punctuated by rice paddies and sugar palm trees (a national symbol) stretch toward Kampong Chhnang.

UNESCO World Heritage Sites are not directly on the route, but two notable ones are easily detachable: Sukhothai Historical Park (about 70 km west of Phitsanulok, a 1-hour detour) and Angkor Wat (about 300 km northwest of Kampong Chhnang, requiring a separate trip). This journey doesn't pass through any UNESCO sites, but it connects two countries rich in heritage.

Local commerce along the way includes roadside fruit stalls (Thai mangoes and durian) and Cambodian markets like O Smach, which is a duty-free shopping spot for Thai visitors. In Kampong Chhnang, the province is famous for its pottery and glazed ceramics, using local clay from the Tonlé Sap floodplains. A visit to the village of Andong Russei near the provincial town offers a chance to see traditional kilns and buy handmade pots.

The route combines well-paved highways in Thailand with mixed conditions in Cambodia. Thai side: Highway 12 is a major artery, with four lanes in sections and regular gas stations (PTT, Bangchak). Cambodia side: National Road 68 is newly upgraded but still has some unpaved patches; National Road 6 is a main corridor with ongoing improvements.

• Fuel costs: In Thailand, expect about 32 baht/liter for gasoline; in Cambodia, roughly 4,000 riel (1 USD) per liter. Total fuel cost for an average car (10 km/l) around $70–90.
• Tolls: None on this route except a small fee for the Friendship Bridge at Stung Treng (if applicable) – not on this path.
• Border fee: No formal fee, but visa costs: $30 for Cambodia tourist e-visa.
• Vehicle documentation: In Cambodia, carry vehicle registration and insurance proof; green book and road tax required.

The climate transitions from tropical savanna in Phitsanulok (hot season 35–40°C, March–May) to monsoon climate in Cambodia (rainy June–October, 30°C but high humidity). The best season to drive is November to February when it's cooler (20–30°C) and dry. During rainy season, some unpaved portions in Cambodia become muddy, but main roads are passable.