Otter Hole, Cave formation in St Arvans, United Kingdom
Otter Hole is a cave located at the base of a cliff along the River Wye in St Arvans. Inside, the system contains multiple underground passages and chambers formed by natural water erosion over thousands of years.
The cave developed gradually as water carved through limestone over many centuries. The Royal Forest of Dean Caving Club discovered it and has managed visitor access to preserve the site ever since.
Local speleologists conduct guided expeditions through the cave system, sharing knowledge about its geological features and mineral formations.
Visits require booking in advance with the Royal Forest of Dean Caving Club, as groups are kept small for safety. Only adults aged 18 and older can enter, and basic fitness is helpful for navigating the passages.
The Hall of 30 contains large stalagmites in various colors from mineral deposits, including white calcium carbonate and arsenic-tinted formations. These colored mineral structures are uncommon in British caves and create striking visual contrasts inside the chambers.
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