Chinese rescue efforts in Tibet have been suspended over fears a lake that formed after the landslide will cause further flooding.
Officials have been monitoring rising water upstream from Gyriong port - the land border between Nepal and Tibet which was swept away in a torrent of mud and water during the landslide on Wednesday.
They now fear after hours of heavy rain, the lake that has formed within the debris could burst its banks and cause more flooding in the coming days.
Rescuers in the area have been told to stop operations for now, according to reports in Chinese state media.
More than 550 people have been reported missing on the Tibetan side of the border - 260 are foreigners including pilgrims making their way to the sacred Mount Kailash in Tibet.
Nepal Police say that as of 09:00 local time (04:15 BST) on Friday, 475 people have died due to Wednesday's floods in the Resuwa district.
The force adds that rescue and search operations are continuing as are efforts to "remove roadblocks" from affected areas.
At least 469 people have died in Nepal and hundreds are missing, more than 48 hours after flash flooding devastated the Himalayan border region.
In Tibet, three people have died and more than 550 are missing. It is not clear if the latest figures overlap.
Rescuers searching for survivors are "on edge" over the reports that a second flood could hit the disaster zone, a Red Cross official tells the BBC.
A collapsed glacier caused the huge flood wave, local officials tell the BBC. The surge tore through houses and roads, and destroyed a key Nepal-Tibet border crossing.
Tens of thousands of tourists visit the area every year - the BBC has been speaking to relatives of the missing. Two sisters whose parents are missing say "we just love them a lot and want them to come home"
