Famous salt mines include Wieliczka in Poland (
维利奇卡盐矿), Sichuan's
自贡盐矿 (Zigong Salt Mines) — central to ancient China's salt-trade economy — and the Qaidam Basin (
柴达木盆地) in Qinghai, which holds some of the world's largest salt deposits. Salt was a state monopoly in imperial China for over two thousand years.
