But the plant hunters weren't the first people to travel here.
Along the Nujiang, less than 30 rope crossings allow locals passage across the torrents.
Tiny hamlets cling to the slopes.
This morning, it's market day, drawing people from up and down the valley.
Hanging from simple rope slings, people have been using the crossings for many hundreds of years.
In such narrow, precipitous gorges it's by far the easiest way to get around.
Once across, the steep sides mean it's still a hike. Many trek for hours by foot before they get to the market.
The immense valley is home to over a dozen ethnic groups.
Some, like the Nu people, are found only here.