Everything we know about Nepal's catastrophic floods

* Catastrophic flash floods wreaked havoc across Nepal and Tibet after the region was struck on Wednesday

* The flooding was triggered by a glacial collapse and debris flow, which prompted seismic activity

* At least 162 people have been killed and nearly 1500 people are still missing

* 22 people are missing from three separate hiking tours, 15 of which 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

* "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

* "The loss of life and the scale of the destruction is devastating. I wanted to say first, our thoughts and condolences are with those who have lost loved ones and those whose loved ones are missing and to all affected by this disaster." - Foreign Minister Penny Wong

* "What makes this disaster unusual is it was so sudden, coming without warning. I've heard people were notifying neighbours to leave before the flooding hit, but because there was no rain leading to the flash floods, many of these warnings weren't taken seriously." - Dr Soniya Rijal, a Nepalese postdoctoral research associate at the University of Sydney

* "With global warming, there is an expectation similar patterns of disasters will recur. We can benefit from the implementation of a warning system, similar to those triggered for tsunami warnings after 2004's tsunami." - University of Sydney Associate Professor Nader Naderpajouh

* Anyone with information is encouraged to contact the Australian government 24-hour consular emergency centre at 1300 555 135 within Australia or +61 2 6261 3305 from overseas