Nepal has banned people from climbing its mountains by themselves as part of a package of measures that it hopes will reduce accidents.
A record number of people set up camp this year to try climb Mount Everest, the world's highest peak.
But under laws Nepali officials have introduced, climbers from foreign countries will now have to be accompanied by a guide.
Blind and double amputee climbers will also be banned from scaling any mountain in the country, a decision that some have criticised as a discriminatory move.
Tourism officials said the laws had been revised to make mountaineering safer and to decrease medical evacuations and deaths.
Six people have lost their lives on Everest so far in 2017, including Min Bahadur Sherchan, an 85-year-old who was attempting to reclaim the title of world's oldest person to reach the summit.