Everything we know about Nepal's catastrophic floods

* A glacier collapse unleashed a huge torrent of rock, ice, mud and debris through Himalayan mountain river systems across Nepal and Tibet on Wednesday

* At least 579 people have been killed and almost 2500 people are still missing

* More than 90,000 people are estimated to have been affected by the disaster

* 22 people are missing from three separate hiking tours; 15 of them were travelling with US-based tour company Himalayan Glacier Adventures

* A group of 14 family friends were on the Himalayan Glacier Adventure tour, all Hindu-Australians completing a sacred pilgrimage

* More than 300 other foreign nationals are also missing, along with more than 1000 Nepalese

* Nepal has accepted Australia's offer of $5 million in humanitarian aid

* Aid will go towards emergency kits of food and water, along with supporting Australian-based rescue and recovery organisations

* Additional personnel to support Australians affected are being sent to the region

* Nepalese-Australian families gathered for prayers and held a minute's silence for those lost to the floods

* "There was quite a bit of despair and anxiety in (the) community; we're doing our best to support the Tibetan and Nepalese communities here in Australia." - Assistant Immigration Minister Matt Thistlethwaite

* "People would have seen the footage, which is a truly horrific event. At this point, Nepal is a developing country. It doesn't have the resources that an event like that would have in Australia, so information is difficult." - Prime Minister Anthony Albanese

* "We are urgently working to identify how many Australians have been in the region and to confirm the welfare of any Australians who are not accounted for." - Foreign Minister Penny Wong

* "The gravity of the situation is worse now because whole towns have swept away. Now there is nothing, it's just a mudslide." - Australian Nepalese Multicultural Centre vice president Keshav Kadel