Dark Cave (Hang Toi),Vietnam

• Dark Cave entrance zipline (thrilling entry into the cave area)
• Underground river & swimming through clear cave water
• Mud bath area — natural mud pools for playful bathing
• Bat and bird colonies visible at cave openings and nearby dusk flights
• Kayaking through cave passages and short cave treks

• Subterranean river and wet-cave environment rather than large dry caverns
• Adventure activities integrated on-site (zipline, rope swings, ladders)
• Rich karst scenery around the cave with dramatic limestone outcrops
• Close proximity to other Phong Nha attractions (e.g., Paradise Cave, Phong Nha Cave)

• Zipline across the cave entrance and walk into the cave complex
• Guided trek and short cave exploration in low-light conditions
• Swimming and floating in the underground river
• Mud bathing and sliding in natural mud pools
• Kayaking or bamboo-boat rides in calmer sections
• Wildlife observation (bats at dusk, cave-adapted insects)

Dry season (February to August) is ideal — lower water levels, safer access, and better visibility. The rainy season (September–January) can bring higher water levels and some tour disruptions.

Tropical monsoon climate: hot and humid with temperatures commonly between 25–35°C (77–95°F) in the warm months; heavier rain and occasional flooding during the wet season.

Packages and prices vary by operator. Typical guided-adventure packages (zipline + cave entry + mud bath + kayak) are commonly offered and often include gear, guide, and transport from Phong Nha village. Expect local-package pricing (subject to change). Standard visiting hours are usually around 7:00–17:00 but confirm with your tour operator.

Dark Cave is near Phong Nha village, about 40–50 km north of Dong Hoi (Dong Hoi Airport is the nearest airport). Access options: motorbike or car from Phong Nha, local shuttle services, or organized tour transfers. Some sections involve ladders, low-light passages, and slippery terrain — not suitable for travelers with serious mobility restrictions.

Half-day to full-day (3–6 hours) depending on whether you combine Dark Cave with other nearby caves/attractions.

Bring swimwear, quick-dry clothing, water shoes or sturdy sandals, a change of clothes, towel, waterproof bag, insect repellent, and a small headlamp if you prefer extra light (guides provide basic lighting and safety gear).

Try local Quang Binh specialties in Phong Nha village (fresh river fish dishes, local rice dishes and street snacks). Souvenirs: local handicrafts, food products (dried goods, sauces), and small Phong Nha/karst-themed mementos.