Nepali police said 469 bodies had been recovered across eight affected districts, with Chitwan the worst hit at 178 deaths.
Three people have been confirmed dead on the Chinese side of the border.
More than 2,500 have been evacuated in total, and around 1,400 remain missing, including hundreds of foreign nationals.
In Nepal, rescuers are still searching for 910 people, 517 of them foreigners.
In Tibet's Gyirong county, 499 residents and 555 tourists were evacuated, while 558 people – including 260 foreign nationals – are still unaccounted for, China's Xinhua news agency reported.
Nearly 700 firefighters, backed by drones and sniffer dogs, have been deployed to the disaster zone, though damaged roads are making access difficult, state broadcaster CCTV said.
Tents, food, drinking water and generators are being brought in.
China's water resources ministry has warned of a serious new threat: a landslide-dammed lake formed at the confluence of two rivers in Nepal is at high risk of bursting, which could trigger further flooding downstream.
The lake, already overflowing, is estimated to hold two million cubic metres of water, with another three million expected to flow in over the next three days.
Authorities are monitoring the situation closely and modelling what would happen if the natural barrier gave way.
The US Geological Survey said the disaster was triggered by the collapse of a high-altitude glacier, sending ice and debris crashing down and unleashing a huge surge of water into mountain rivers.
The resulting mudslide swept through settlements on the China-Nepal border at speeds of around 50 metres per second.
Tibet's remote autonomous region is normally off-limits to foreign journalists, and travel there requires tightly controlled permits.
(ał)
Source: PAP