Calders Geo is Britain’s largest cave.
Calders Geo is located on the western cliffs of Eshaness, Shetland. It is the largest cave in Britain, measuring 60 foot tall with a floor area over 5,600 squared metres.
It was discovered by geologist Jonathan Swale who used a laser range-finder to take measurements of the cave. The cave is only accessible by kayak on calm seas.