Rescue and search operations are continuing along the Nepal-Tibet border following the powerful floods that struck northern Nepal on Wednesday. The Nepal Tourism Board said 320 foreign nationals are among those reported missing.
Meanwhile, Chinese authorities said landslides and flooding in Tibet have killed at least 16 people and left 546 others missing. According to Chinese state media, 261 foreign nationals from 23 countries are among the missing.
China's CCTV reported that the missing foreigners include citizens of Britain, Nepal, India, the United States, Latvia, Canada, Australia, South Africa, Malaysia, Germany, Russia, Ireland, Estonia, France, the Netherlands, New Zealand, Finland, Lithuania, Portugal, Ukraine, Spain and Hungary.
Chinese authorities said the relevant embassies and consulates had been notified about the missing foreign nationals.
Nepali authorities had earlier reported 33 British nationals missing, although it remains unclear whether the 15 British citizens listed by Chinese authorities are among the same group.
According to CCTV, the latest figures from Gyirong County in Shigatse showed 16 deaths and 546 missing people as of 6pm Saturday local time. The death toll had previously been reported at seven.
Officials said the landslides caused extensive casualties and damage at the Gyirong border port.
In Nepal, the National Disaster Risk Reduction and Management Authority has also warned of rising water levels in the Bhote Koshi River, urging people living near the river to remain alert.
The powerful floodwaters and debris swept through several tourist and religious areas in northern Nepal on Wednesday, causing widespread destruction. A lake formed following the flooding has begun to recede, reducing concerns that it could burst and trigger further devastation.
The United States has announced $3.6 million in humanitarian assistance for flood victims in Nepal, including emergency food supplies for 10,000 affected families for three months.
The US State Department said American embassies in Nepal and China are coordinating with local authorities to assist US citizens and support relief efforts.