Ban Gioc Waterfall – actually several falls – is a popular tourist attraction on the Quay Son River in the far north of Vietnam, along the country’s border with China. The falls are nestled in the rugged, lush mountain terrain of northern Vietnam. In fact, the border between Vietnam and China runs down the middle of Quay Son River. There are tourist centers on both sides of the river. Apparently, Vietnam and China had to negotiate a deal that allowed sightseeing boats to traverse the river border while they brought groups of Chinese and Vietnamese tourists to see the falls up close. Unfortunately, trails on the Vietnamese side that led to overviews of the falls were closed off and guarded by a couple of surly guys who snarled if anyone came to near.