Vietnam's most memorable landscapes line the classic backpacker route from north to south. Three UNESCO World Heritage sites showcase the country's natural wonders: karst bays in the north, river caves in the centre, and jungle in the south. All sit within reach of cheap hostels and local transport.

Ha Long Bay draws crowds for its limestone towers rising from the sea. Day cruises from Hanoi cost US$65 to $120, with shuttles from Hanoi adding US$30 to $40 return. Two-day, one-night cruises run US$120 to $300 per person, according to Indochina Tour's May 2026 prices. Lan Ha Bay, off Cat Ba Island, offers the same scenery with fewer boats and more kayaking. Full-day trips with lunch cost about US$42 per adult on Expedia as of October 2026.

Ninh Binh mirrors Ha Long's limestone formations but replaces the sea with rice paddies and rivers. Trang An's rowing boats drift through caves like Dot Cave, over 1 km long. Tickets cost 250,000 VND (about €8) per adult. The Endangered Primate Rescue Center sits nearby at Cuc Phuong National Park, with entry at 60,000 VND (about €2).

Phong Nha-Ke Bang National Park holds the country's major caves and sits in Quang Tri province as of July 2025. Paradise Cave costs 270,000 VND (about €9) including an electric buggy ride through chambers of stalactites. Phong Nha Cave charges 150,000 VND (about €5) entry plus 550,000 VND for a shared boat split among up to 12 people. Dark Cave's zipline, kayak and mud bath package costs 350,000 VND (about €12). The night train from Hanoi takes about 10 hours to Dong Hoi, or buses run four hours from Hue. Guesthouses rent scooters for about 120,000 VND daily. Hostels in Phong Nha offer dorms from €5 a night.

Son Doong, the world's largest known cave, remains out of reach for most travellers. Only licensed expeditions visit, capped at about 1,000 visitors yearly in groups of up to 10. The price runs nearly 80 million VND (about €2,650) per person, and all 2026 and 2027 slots have filled. New bookings open for 2028.

Bring cash to caves throughout Vietnam. Most ticket counters take no cards, and ATMs sit in town, not at park entrances.