Search operations continued in Nepal for around 6,000 people still unaccounted for nearly four weeks after flash floods that killed more than 1,400, with the death toll later rising past 1,450.

Nepal Police said the death toll from the August 26 floods had reached 1,451, with more bodies recovered from affected areas.

The floods originated near the Nepal-Tibet border and devastated towns and villages in northern and central Nepal. The Bhotekoshi River, which flows south from the Himalayan border region, carried the floodwaters downstream, sweeping away homes, vehicles, roads and bridges and damaging hydropower projects.

Search efforts have continued across river stretches, debris fields and damaged hydropower projects in Rasuwa and neighbouring districts, including at the Upper Trishuli-1 site.

The disaster also affected the Chinese side of the border, where the floods killed 43 people and left more than 500 missing, according to Chinese media.

Homes were destroyed and residents displaced; at least one displaced resident, 43-year-old Kalpana Thapa Magar, was reported looking at the remains of a house swept away by floodwaters in Betrawa. Sources gave the date of the latest toll update as September 20, though reports differed on the year.