Trat to Nong Bua Lamphu Road Trip Guide

The overland route from Trat, Thailand's easternmost coastal province, to Nong Bua Lamphu in the northeast spans roughly 800 kilometers if you take Highway 317 and 2, a drive that typically takes 9 to 10 hours without stops. The first 50 kilometers east of Trat follow the coast of the Gulf of Thailand, where the road bends through mangrove forests and rubber plantations before cutting inland past the Khao Banthat mountain range, the natural border with Cambodia. This corridor was once a key supply line during the Khmer Rouge era, but today it's a smooth, well-maintained highway that gradually transitions from tropical lowlands to the sandstone plateaus of Isan.

Fuel is readily available along the entire route, with PTT and Bangchak stations located every 30-50 kilometers on major highways, and closer in towns. As of 2025, diesel prices hover around 30-32 baht per liter, and a full tank (50 liters) will cost about 1,500-1,600 baht, covering roughly 600 kilometers; budgeting 2,000 baht for fuel is realistic for the whole trip. Toll fees apply on the elevated section of Highway 7 and on Highway 9 near Bangkok, but you can avoid them by sticking to the standard national highways, which have no tolls.

• Weight-restricted bridges on Highway 317 near Khao Khitchakut limit trucks to 30 tons; passenger cars are unaffected.
• Rest areas, typically with restrooms and small shops, are spaced every 100-150 km; the most reliable are at Km 21 on Highway 3 and at the Wang Nam Yen junction.
• Road tolls: 120 baht on Highway 7 (Bang Na–Chonburi) if used, but optional.

The highways are pothole-free and well-marked, but wildlife, especially cattle and water buffalo, often wander onto the road at dusk in rural areas, so extra caution is needed between 6-8 PM. Roads are lit in urban sections but completely dark in between; keep your headlights on low beam and watch for unlit agricultural vehicles. For families, the best child-friendly stops include the Khao Kheow Open Zoo (near Si Racha, just west of the route) and the Suan Son Pradiphat beach park in Chanthaburi, both with playgrounds and safe swimming; in Nong Bua Lamphu itself, the Ubonrat Dam reservoir offers boat rides and picnic spots. Pet owners will find that most hotels in provincial capitals accept small pets, but rural resorts may not; it's best to call ahead. For fatigue management, plan to stop at the 200-km mark and every 2 hours; the rest area at Mai Kaen (on Highway 2) has air-conditioned rooms for rent by the hour. A hidden detour worth taking is the road to Kaeng Hang Maeo, a little-known waterfall in Chanthaburi province, just a 7-km gravel drive off Highway 317.

As you climb from the coastal plains to the Dangrek escarpment, the air dries out and the vegetation shifts from dripping rainforest to deciduous dipterocarp forest, with occasional stands of teak. The only UNESCO World Heritage Site near the route is Preah Vihear, just across the Cambodian border from Kantharalak in Sisaket province; a side trip there adds 50 kilometers and requires a border pass at the checkpoint. This ancient Khmer temple, built on a 525-meter cliff, is visible from the Thai side, and Ban Pha Mo I Daeng village offers the best panorama.

Local commerce thrives at the weekly markets that rotate through the region, most notably the Tha Mai fruit market near Chanthaburi, where durian and mangosteen are sold at wholesale prices during harvest (April to June). Farther north, the town of Pak Thong Chai (on Highway 304) is the silk-weaving hub of Thailand, with dozens of family workshops along the main road; visitors can watch the entire process from mulberry leaf to loom. For a quick culinary stop, roadside stalls selling som tam and kai yang are everywhere in Isan, but the best-known cluster is at the Wang Nam Yen intersection, where three famous grilled chicken vendors have operated for decades.

The route's aesthetics shift with the season: from November to February, the weather is cool and dry, with clear skies and temperatures around 25-30°C, ideal for driving; from March to May, the hot season brings shimmering heat and occasional burning of agricultural fields, which can create smoke haze; and from June to October, the monsoon drenches the upper reaches, turning the countryside lush but slippery.