The Gloucester Hole is a roughly square opening in the limestone cliffs of the River Wye, directly opposite the town of Chepstow.
Wood, wrote in 1901 that nearly 50 years earlier he had quizzed the oldest inhabitants and discovered that this natural cave had been enlarged and fitted with a crane at its mouth to unload large ships that could moor there in deep water, but could not easily dock at the shallower wharves on the Chepstow side of the river.
For many years mooring chains and rings in the cliff below survived to support this explanation.
[1] Next to the Hole is a Union Flag which was first painted in 1935 to mark the Silver Jubilee of King George V by some Chepstow salmon fishermen, and is regularly repainted.
[2] During flooding in January 2014, the water level rose above the flag for the first time in many years.