During the dry season, the water level of the salt lake drops, revealing a lot of salt around the edges.
The locals come to dig for salt, perform simple refining, and then sell it elsewhere.
Some salt lakes are located in mountainous areas, sparsely populated with difficult paths, requiring mountain climbing to sell the salt.
These people use goats to carry the salt, traversing mountains and valleys, to find those interested in buying salt.
They tie a cloth bag to the goat, containing about a dozen pounds of salt.
With twenty to thirty goats, watched over by two people, they transport hundreds of pounds of salt, enough income to support a family.
In Ma Lin's hometown, salt isn't that expensive, and the income from selling salt isn't high.
However, on Pin Star, which is in the Stone Age, the salt trade is a hugely profitable industry.
The people of the Wild Dog Tribe still rely on drinking blood and eating soil to supplement their salt intake.
