Daneway Portal, Sapperton Tunnel in the derelict Thames and Severn Canal, Sapperton

NOTES: Sapperton Tunnel burrows under the highest part of the Cotswold Hills through limestone and Fullers earth and it was the longest canal tunnel at 3.5km (2.25 miles) when it was completed in 1789. This section of the Thames and Severn Canal was abandoned in 1927 and subsequent roof falls in the brick lined sections blocked the tunnel near the Daneway end and in the middle.