ZIGONG, a thriving industrial centre, has long been an important source of salt, tapped for thousands of years from artesian basins below the city. In the fourth century, the Sichuanese were sinking 300m-deep boreholes here using bamboo-fibre cables attached to massive stone bits; by the 1600s, bamboo buckets were drawing brine from wells bored almost 1km beneath Zigong, centuries before European technology (which borrowed Chinese techniques) could reach this deep. Natural gas, a by-product of drilling, was used from the second century to boil brine in evaporation tanks, and now also powers Zigong’s buses and taxis.

Book through Rough Guides’ trusted travel partners

China features

The latest articles, galleries, quizzes and videos.

20 picturesque Christmas destinations

20 picturesque Christmas destinations

Dreaming of a trip this Christmas? We're here to help. From glittering cities to a few snowy escapes, here are 20 classic destinations for a festive break. …

12 Dec 2017 • Rough Guides Editors camera_alt Gallery
An expert's guide: where to stay in Shanghai

An expert's guide: where to stay in Shanghai

Shanghai has to be a contender for the buzziest city in Asia, a thriving business hub that's brashly modern yet wears its history on its sleeve. Dense with glit…

23 Oct 2017 • Simon Lewis insert_drive_file Article
The best aerial views in the world

The best aerial views in the world

Got a head for heights? If you're craving a new perspective on your travels, the best thing to do is get up high. From mountain-top panoramas to cityscapes, her…

17 Oct 2017 • Olivia Rawes camera_alt Gallery
View more featureschevron_right