Mong Cai to Cat Ba: Ultimate Road Trip Guide

The border city of Mong Cai sits at Vietnam's northeast tip, where the Ka Long River meets the Gulf of Tonkin. Your 360-kilometer drive to Cat Ba Island follows the coastal highway QL18 then QL10, crossing the new Vân Đồn–Mông Dương bridge opened in 2022. The trip typically takes 6.5 hours without stops, but you'll want to pause at the vast Bái Tử Long National Park and the limestone karsts around Lan Hạ Bay.

QL18 sees heavy truck traffic; keep a safe distance. Roadside rest stops with clean toilets appear every 30–50 km; the service area at Km 45 near Quảng Yên has a restaurant and playground. For kids, the Sun World Hạ Long amusement park offers a convenient break; it's just off QL10. Pets are allowed at most gas stations and rest stops, but ferries require them to be leashed and muzzled. Plan for a 1.5-hour lunch break in Hạ Long; the drive time extends by that. For hidden gems, try the cave pagoda of Cửa Ông (or Cửa Ông Temple) in Cẩm Phả – a serene detour. This how to find the best stops and hidden gems between cities guide offers more insights. To avoid fatigue, alternate drivers every 2 hours; early morning starts dodge heat.

• Best stops Mong Cai to Cat Ba: Bái Tử Long boat trip, Hạ Long seafood lunch, Lan Hạ Bay sunset.
• How long to drive Mong Cai to Cat Ba: 6.5 hours plus ferry wait (typically 1-2 hours in summer).
• Is it worth driving Mong Cai to Cat Ba: Yes, if you value coastal scenery and flexibility.
• Things to do between Mong Cai and Cat Ba: Visit Vân Đồn floating village, trek in Bái Tử Long, kayak in Lan Hạ.

Fuel stations cluster along QL18, especially near Cẩm Phả and Uông Bí; plan for a fill-up at around half tank (VND 1.15 million for a typical sedan). Tolls add up: three booths between Cẩm Phả and Hạ Long, totalling VND 70,000 for cars under 7 seats. The expressway QL10 from Hạ Long to Hải Phòng is smooth, but the final section to Cát Bà requires a 30-minute ferry from Phà Đồng Bài (cars VND 180,000, motorbikes VND 45,000, runs hourly until 20:00). Bridge tolls and ferry fees are separate; keep small change ready.

• Road quality: QL18 is 4-lane, well-maintained; QL10 is 6-lane expressway.
• Drive time increase: +30 minutes during peak summer weekends.
• Parking on Cat Ba Island is limited; hotels often charge VND 50,000–100,000 per night.

Bái Tử Long National Park (entrance VND 40,000) shelters 1,000 islands and rare langurs; a short boat tour costs VND 150,000. Lan Hạ Bay, the quieter sister of Hạ Long Bay, offers untouched beaches like Ba Trai Đào. Along the way, the town of Cẩm Phả is a coal-mining hub with dramatic black cliffs, while Vân Đồn's floating fish farms date back to a 12th-century trading port. In Mong Cai, the border market sells Chinese goods; haggling is expected.

• UNESCO site: Hạ Long Bay, a World Heritage site since 1994, lies just 50 km south of Cẩm Phả.
• Local specialty: 'cha muc' (squid cake) in Hạ Long, best at local markets.