Sihanoukville to Chon Buri: Road Trip Guide

The drive from Sihanoukville, Cambodia's premier port city, to Chon Buri, Thailand's eastern seaboard hub, spans roughly 750 kilometers via National Road 4 and Thailand's Route 344. This route, often used by overland travelers, offers a mix of coastal scenery and inland agriculture. Notably, the border crossing at Hat Lek (Koh Kong) involves a short ferry across the Klong Yai River, a unique step in the journey.

Key Facts at a Glance

The best stops Sihanoukville to Chon Buri include the Cardamom Mountains, Trat's beaches, and Pattaya's attractions.

This route traverses the Cardamom Mountains, a biodiversity hotspot with rainforests and waterfalls, before hitting Thailand's eastern coast. Along the way, local markets in Trat sell fresh tropical fruits and seafood. The UNESCO World Heritage Site of Preah Vihear is far north, but a detour is not recommended due to time; closer, the Temple of Phanom Rung in Thailand is a possible side trip. Climatically, expect heavy rains from June to October, which can slow driving; the dry season (November-February) offers clearer skies and better views.

Hidden off-route spots include the quiet beaches of Koh Kong Province and the hiking trails of Khao Khitchakut National Park in Chanthaburi. These areas provide a break from the highway and a glimpse of local life.

Road quality varies: Cambodia's NR4 is well-paved but narrow, while Thailand's highways are modern and well-marked. Aggressive overtaking is common in Cambodia, so stay alert. For families, consider stops at the Sihanoukville Port's public beach, or the Trat Youth Center's playground. Pet-friendly accommodations are limited but exist in Trat and Chon Buri; always confirm policies. Fatigue management is key: plan rest stops every 2-3 hours at designated rest areas or roadside cafes. The how to find the best stops and hidden gems between cities guide helps identify safe rest points.

• Emergency numbers: Cambodia 117, Thailand 191.
• Always carry water and snacks, especially in remote areas.
• Be aware of animals on the road near rural sections.

Departing Sihanoukville, follow National Road 4 (NR4) north to Phnom Penh, then switch to NR1 toward the border at Bavet/Moc Bai, although a less congested alternative goes via Koh Kong and the coastal highway. That coastal route avoids Phnom Penh's traffic and cuts distance via the ferry from Krong Preah Sihanouk to Koh Kong. After crossing into Thailand at Hat Lek, drive north on Route 3 to Trat, then join Route 344 for direct access to Chon Buri.

• Fuel stops are frequent in Cambodian towns; Thailand's PTT stations along Route 344 offer 24/7 service.
• Tolls apply on some Thai expressways near Chon Buri; keep small change ready.
• Border formalities typically take 30-60 minutes; ensure vehicle documents are in order.