Britain's Prince Harry says he will extend his trip to Nepal by six days to help rebuild a school damaged by a devastating earthquake last year.

The 31-year-old prince said he will work with a charity group in a remote village, but would not give the location.

He made the surprise announcement at the end of what was to be a five-day official visit, during which he visited earthquake-damaged heritage sites, temples and a camp where people made homeless by the April 2015 earthquake are still living.

Harry arrived in Nepal on Saturday on his first trip to the Himalayan nation.

He is the first member of the British royal family to visit Nepal since it abolished its centuries-old monarchy in 2008.