Ba Ham Lake

The Lake is surrounded by towering mountains and is so secluded that it may only be reached by kayak or Vietnamese sampan boat. Sailing through the tunnels that connect Ba Ham, visitors can almost touch the waterfalls of stalactites hanging from the 4-meter tall ceilings.
The water of the lake is deep but so clear that from the surface, fishes can sometimes be seen swimming in shoals. Around the lakes, visitors may spot Golden Langur monkeys, flying squirrels, and parrots, and other animal species that are endemic to Halong Bay.

photo source: baoquangninh.com.vn