Sanquhar is a town on the River Nith in Dumfries and Galloway, Scotland. It lies north of Thornhill as well as west of Moffat. It is a former Royal Burgh. Sanquhar is noteworthy for its tiny post office, established in 1712 and held to be the oldest working post office in the world. It was likewise the place where the Covenanters, that opposed episcopalisation of the church, signed the Sanquhar Declaration renouncing their allegiance to the King, an occasion memorialized by a monolith generally street. The church of St Brides contains a memorial to James Crichton, a 16th-century polymath. The damages of Sanquhar Castle stand close-by. Nithsdale Wanderers, the neighborhood team, were formed in 1897. In 1924-- 25, Wanderers won the Scottish Division 3.