比亚松是玻利维亚的城镇，由波托西省负责管辖，位于该国南部，距离首府波托西347公里，毗邻与阿根廷接壤边境，始建于1910年5月20日，面积2,558平方公里，海拔高度3,447米，2005年人口28,045。

Villazón is a town in southern Bolivia, on the border with Argentina. It sits directly across a river from La Quiaca in Argentina. The town is a busy trading hub, with large quantities of goods flowing north.

It is also a heavily used transit hub for tourists passing into Bolivia. A train line connects Villazón with Tupiza, Uyuni and Oruro. Two train services, the Expreso del Sur and slightly cheaper Wara Wara del Sur, each run twice a week. Buses also connect to many destinations.