Koh Rong to Can Gio Drive: Routes & Hidden Stops

Koh Rong's northern pier at Prek Svay (10.733°N, 103.242°E) has no direct car ferry, so every driver must first hop a passenger boat to Sihanoukville, then pick up a vehicle. The overland route follows National Road 4 (NH4) for 230 km to Phnom Penh, then switches to National Road 1 (NH1) through Bavet to the Moc Bai border crossing. From there, Vietnam's QL22 and the Ho Chi Minh Highway bring you to Can Gio, a district on the Dong Nai River estuary. Total road distance is roughly 460 km and takes 8–9 hours, excluding the sea crossing and border formalities.

Almost immediately after leaving Sihanoukville, the terrain shifts from coastal palms to the flat agricultural plains of Kampong Speu, where you'll see endless sugar palm trees and rice paddies. The stretch along NH4 passes through the Damrei Mountains, which rise abruptly on the western horizon. About midway, the Kirirum National Park entrance (11.27°N, 104.07°E) beckons with a short detour to its 800-meter summit, offering panoramic views.

Once over the border, the Vietnamese delta unfurls: the Mekong's silt creates lush orchards and water hyacinth canals. The final 40 km into Can Gio run along the Rung Sac forest, a UNESCO Biosphere Reserve since 2000, where saltwater crocodiles inhabit the mangrove creeks. Local commerce thrives around the ferry terminals: in Sihanoukville, seafood stalls grill fresh squid at $1 per skewer; near Moc Bai, vendors sell dragon fruit from Cai Lay; and in Can Gio's Vam Sat village, women gather mussels and shrimp from the estuary.

No car ferry operates to Koh Rong; you must leave your vehicle at Sihanoukville's port or use a rental service that provides a car on the mainland. The border at Moc Bai opens daily from 7:00 to 22:00, and you'll need both Cambodian and Vietnamese entry stamps plus a vehicle import permit for the latter (arrange via your rental company). Fuel is cheaper in Vietnam, so it's wise to fill up before crossing; expect to spend about $40–$50 on fuel for the entire drive, with diesel costing around $1.10/L in Cambodia and $0.90/L in Vietnam.

Road tolls in Vietnam add roughly $5, payable by cash or ETC card. If you plan to use the new expressways near Ho Chi Minh City, check for additional fees. The NH4 and NH1 are mostly two-lane with moderate traffic, while the Can Gio approach requires a ferry crossing from Binh Khanh (operating 24/7, fee ~$1.50 per car). For the best stops and hidden gems between these two destinations, see how to find the best stops and hidden gems between cities.

• Border processing time: 45–90 minutes
• Vehicle permit fee in Vietnam: ~$20
• Can Gio ferry: runs 24h

Both NH4 and NH1 are paved but lack guardrails and adequate lighting; expect to share the road with motorbikes and overloaded trucks. Drive defensively, especially at night, when many vehicles use high beams. The wet season (June–October) brings sudden downpours that reduce visibility and make roads slippery, so plan your drive for the drier months of November–May if possible. Is it worth driving Koh Rong to Can Gio? Yes, if you crave the freedom of a road trip and want to combine beach, mountains, and mangroves, but be prepared for crowded city traffic near Ho Chi Minh City.

For family trips, the big draw is the Ky Quan Pagoda in Chau Doc (not directly on route but a 2-hour detour) with its petting zoo and cable car – a sure hit with kids. Most hotels along the way offer kid-friendly amenities, and the ferry rides themselves are an adventure. Pets are generally allowed in cars, but require an international health certificate and a valid rabies vaccine; both Cambodia and Vietnam enforce strict quarantine laws at the border. Rest zones are sparse, but the provinces of Takeo and Long An have several clean roadside restaurants with hammock gardens. The easiest fatigue break is at the Prey Veng coffee stop (mile 185), where you can stretch in a shaded orchard. Local commerce enlivens the route with daily morning markets in every town – don't miss the shaved ice and coconut pancakes at Phnom Penh's Central Market before your departure.