Families of Australians missing in the Nepal-Tibet floods are trying to piece together their loved ones' last movements, amid concerns about a lack of information on the Chinese side of the border.

At least 35 Australians are still unaccounted-for in Nepal as rescuers pull hundreds of survivors from the mud and flood zone.

Families across the country are reeling in the aftermath of the devastating flash flooding in Nepal and Tibet, as loved ones at home hold out hope for any good news.