History

The salt wells of Leshan (乐山, then Jiading 嘉定 in Sichuan), in 1914. The Sichuan basin, an old inland sea, was rich in salt and gas (which was burned to evaporate the salt). https://t.co/3PBVcmu1sR pic.twitter.com/uI38jjdiOK

— Dan Hopper (@evohopp) July 17, 2022