Hidden inside Tuong Mountain — an ancient natural outpost guarding the 10th-century Hoa Lu capital — Galaxy Cave (Động Thiên Hà) combines a dry crystal chamber with an underground river that shimmers like the Milky Way.
Reached by a short sampan ride along the Ben Dang canal and a stone path skirting the foot of Tuong Mountain, Galaxy Cave stretches 700 meters into the heart of the Trang An UNESCO massif.
Visitors first walk through a dramatic dry chamber illuminated by natural skylights before boarding a boat inside the mountain to glide down a subterranean river beneath thousands of glittering stalactites.
Highlights of Galaxy Cave (Hang Thien Ha)
- Both a dry skylight cavern and a navigable underground river cave
- Ancient 10th-century General Le Hoan canal approach
- Part of the Trang An World Heritage core geological zone
Things to do
Cruise the underground Milky Way chamber
Float in near-silence beneath curtains of crystalline stalactites.
Plan your visit
How to get there
Located in Son Ha commune (Nho Quan district), about 15 minutes from Tam Coc and Trang An.
Best time to visit
Year-round; cool cave interior makes it refreshing on warm summer days.
