All this is down to Yarsagumba, the small, fragile, mummified body of the Himalayan bat moth caterpillar that has been invaded by a fungus - and which is famous throughout the Himalayas as a powerful medicine.
Every year, thousands of tourists come here to trek on the Annapurna circuit which takes them high into the snowy mountains to climb passes over 5,000m (16404ft).
This isolated and barren landscape is home to Buddhist communities who have lived, farmed and traded here for centuries.
Great aphrodisiac
Each year, hundreds of Tibetan traders cross the border illegally into Nepal to buy Yarsagumba from local villagers and sell it back to China. One kilogram can fetch up to $10,000.
"The medical properties of Yarsagumba are numerous and many," says Carroll Dunham, a medical anthropologist who has worked in Nepal for the past 25 years.
"Yarsagumba is known as an immune booster. It's also known as a great aphrodisiac.It works in a way similar to Viagra. It's considered to be helpful for impotence in men and it's considered to be a great stimulant.This has meant that Yarsagumba has become the most valuable commodity in this remote region that has few economic opportunities.
It has become so lucrative that the district government now operates a permit system for those who want to collect Yarsagumba.
.Turf war
For some mountain villagers, the chance to collect Yarsagumba has brought great wealth. But for others, it has brought great misery. i here about this news.In June 2009, seven men from the low-lying Gorkha region of Nepal who came to the mountains to pick Yarsagumba were murdered by a local mob protecting their turf.
The men were attacked with sticks and knives and their bodies thrown into deep mountain ravines.
Nal Prasad Upadhay was the police officer investigaton "It was a very big operation. More than 80 police personnel were mobilised in that case," he says."Two bodies were collected from a very difficult place - the police had to use ropes to recover them. We couldn't find the other five bodies."
Thirty-six men from the remote village of Nar were arrested for the crime and are still waiting for a verdict .
the important of Yarsagumba
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