This sulpherous spring can be found between the river and the A67 just outside Gainford

It was apparently an 1840 borehole for coal (or 1834 from a different source) and with the addition of a railway link sparked some minor interest in Gainford as a Victorian spa town.

The spa fell into disrepair and was vandalised but was then thankfully restored in 2002, the original bowl now stands nearby as a memorial to those involved.