Always wanted to know where salt came from in the ancient days? Then travel to Bo Klua in Nan province, a small village actually named Ban Bo Luang in the valley of the Maern River in the remote mountains of Doi Phu Kha. Mind you Ban Bo Luang is a 90 km trip north of Nan town and will lead over the mountain ridges with stunning views. The old Nan Kingdom was rich because of 2 things, the famous silverware from the Hmong and the famous salt from Bo Klua. The name of the latter translates to "the area of salt". At Ban Bo Luang you can still see 2 old salt pits (Sin Thao) that are still functioning, but the salt produced here is now solely sold as souvenir. A bit north of Ban Bo Luang are actually a few more no active ancient salt pits in the forest of Doi Phu Kha.
The most visited Ancient Salt Pit (Sin Thao) in Ban Bo Luang is along the Marn River and surrounded by souvenir shops & coffee shops. About 100m further, near the old post office, is the second Ancient Salt Pit. At both Salt Pits you can see how the salt is produced.
For more information about Nan province see Destination Travel Guide Nan.