Disputes regarding the border demarcation at this location were settled in "1999 Viet Nam-China Treaty on Land Borderline". Additional talks were held as late as 2009 to clarify the treaty. However, there are controversies regarding the border demarcation around the Falls. One faction holds that the entirety of these falls belongs to Vietnam, and that the stone tablet had been moved there some time during or after the brief Sino-Vietnamese war of 1979. To the southeast, the land dispute also along the Sino-Vietnamese border also includes Nam Quan Gate (Ải Nam Quan) which the Vietnamese claimed as well. Historically, Nam Quan Gate served as the border marker and entry point to Vietnam between Vietnam &amp; China (hence there's also a Vietnamese historical saying, that Vietnam stretched from Cape Cà Mau to Ải Nam Quan).