Cat Ba National Park covers 17,362 hectares — nearly half the entire island — and it is one of the most biodiverse protected areas in Vietnam. For travellers willing to lace up their boots, it offers some of the most rewarding hiking in Southeast Asia: jungle trails, limestone cave systems, spectacular bay views, and the faint, thrilling possibility of spotting one of the rarest primates on earth.
The Park at a Glance
Established as a national park in 1986 and designated a UNESCO Biosphere Reserve in 2004, Cat Ba National Park protects an extraordinary mix of ecosystems: tropical forest, limestone karst formations, mangroves, coral reefs, and freshwater lakes. Over 1,500 plant species and 32 species of mammal have been recorded here, alongside hundreds of bird and reptile species.
The park is open year-round. Entry fees are modest (around 80,000–150,000 VND for foreign visitors), and most trailheads are accessible from Cat Ba Town or, for the Viet Hai route, from Viet Hai Village itself.
The Cat Ba Langur: The World’s Most Endangered Primate
The park’s most extraordinary resident is the Cat Ba Langur (Trachypithecus poliocephalus) — a golden-crowned, black-bodied monkey found nowhere else on earth. Hunted nearly to extinction by the 1990s (population dropped below 40 individuals), intensive conservation work has slowly rebuilt numbers to around 70 today. They live on the limestone cliff faces on the eastern edge of the island, and sightings require an early morning boat-based survey rather than a forest trail — but even a brief glimpse through binoculars of these creatures moving across a sheer cliff face at dawn is something most visitors never forget.
Lan Homestay can arrange morning langur-spotting boat trips from Viet Hai. Ask at reception for current scheduling.
Best Hiking Trails in Cat Ba National Park
Trail 1: Cat Ba Town → Ngu Lam Peak (★★★☆☆)
Distance: ~4 km return | Duration: 2–3 hours | Difficulty: Moderate
The most popular trail in the park winds up through dense jungle to a viewing tower at 177m elevation. On a clear day the panorama is extraordinary: Lan Ha Bay’s karst islands disappear toward the horizon in every direction. The trail is well-marked and manageable for most fitness levels, though it’s steep in places and genuinely slippery after rain. Start early to avoid the heat and catch the best light on the bay.
Trail 2: Cat Ba Town → Viet Hai Village (Full-Day Trek) (★★★★★)
Distance: ~18 km one way | Duration: 5–7 hours | Difficulty: Challenging
The park’s signature experience. This full-day traverse crosses the heart of the national park from Cat Ba Town to Viet Hai Village on the far side, dropping through limestone cave systems, ridge-line jungle walks with bay views, and the final descent through rice paddies into the village itself. A guide is essential (and required for this route) — Lan Homestay’s guides do this trek regularly and know every shortcut and viewpoint. The trail ends at Lan Homestay, where you can spend the night and take the morning boat back to Cat Ba Town. Book a guided trek through Lan Homestay.
Wildlife and Flora
Beyond the langur, Cat Ba’s forests shelter leopard cats, civets, pangolins, and wild boar. Birdlife is prolific: look for the stunning blue Asian kingfisher along streams, large flocks of hornbills in the forest canopy, and sea eagles patrolling the coastline. The park’s cave systems support several bat species, and the coastal waters hold seahorses, dugongs (rare), and over 200 species of fish.
Spring wildflowers (February–April) add vivid colour to the limestone formations, and migratory birds pass through October–November on their way south.
Practical Tips for Visiting
- Start early — the jungle is significantly cooler before 10am, and morning light on the bay is worth the alarm.
- Hire a guide — the main trails are marked, but secondary paths and the full Viet Hai traverse require local knowledge. A guide also dramatically improves your chances of wildlife sightings.
- Carry 2L of water minimum — there’s no resupply on the trail.
- Wear grip shoes — limestone rocks become extremely slippery when wet. Flip-flops and trail sandals are a bad idea.
- Best season: March–May and September–November for stable weather and clear jungle views. Avoid July–August on peak summer days when heat and humidity are extreme.
Book a Guided Trek to Viet Hai Village →
