- Cao Bang province in northeastern Vietnam, bordering China’s Guangxi province, has some well-known historic sites, including including Le Nin stream and Pac Bo cave - the work place of President Ho Chi Minh during the resistance war. Cao Bang province is also known for Nguom Ngao cave, Thang Hen lake, and Ban Gioc waterfall - the largest waterfall in Southeast Asia.

https://vovworld.vn/en-US/discovery-vietnam/ban-gioc-a-majestic-waterfall-785290.vov