The show cave consists of a dry gallery connecting three large chambers, the first of which contains the Witch of Wookey formation.
The River Axe is formed by the water entering the cave systems and flows through the third and first chambers, from which it flows to the resurgence, through two sumps 40 metres (130 ft) and 30 metres (98 ft) long, where it leaves the cave and enters the open air.
The river is maintained at an artificially high level and falls a couple of metres when the sluice is lowered to allow access to the fourth and fifth chambers, two small air spaces.
The southern slopes of the Mendip Hills largely follow the flanks of an anticline, a fold in the rock that is convex upwards and has its oldest beds at its core.
On the Mendips the crest of the anticline is truncated by erosion, forming a plateau.
From the ninth chamber, a dive of about 200 metres (660 ft) passes almost immediately from the Dolomitic Conglomerate into the limestone, and descends steadily for 70 metres (230 ft) to a depth of 23 metres (75 ft) under a couple of high rifts with airbells, which are enclosed air spaces between the water and the roof, before reaching air space in the 19th chamber.
The 20th chamber is at the top of a large boulder slope – 60 metres (200 ft) long, 15 metres (49 ft) wide, and 22 metres (72 ft) high.
Wookey Hole Caves are a series of limestone caverns, a show cave and tourist attraction in the village of Wookey Hole on the southern edge of the Mendip Hills near Wells in Somerset, England. Wookey Hole cave is a "solutional cave", one that is formed by a process of weathering in which the natural acid in groundwater dissolves the rocks.
Some water originates as rain that flows into streams on impervious rocks on the plateau before sinking at the limestone boundary into cave systems such as Swildon's Hole, Eastwater Cavern and St Cuthbert's Swallet; the rest is rain that percolates directly through the limestone.
The continuation is found in the 19th chamber, where 152 metres (499 ft) of passage descending to a depth of 24 metres (79 ft) surfaces in the 22nd chamber – 300 metres (980 ft) of dry passages at various levels with a static pool.