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Chumak (Ukrainian: чумак) is a historic and traditional wagon-based trading occupation on the territory of modern Ukraine in late Medieval and early Modern periods of history. It consisted in the delivery of goods (salt, fish, gran, others) for the purpose of long-distance sales using carts (wagons) harnessed by oxen.
Chumaks grew as a merchant class facilitating trade of salt from the areas of Halychyna as well as the coastal areas of Black and Azov Seas, in addition to other items. (Wiki)