Calder's Geo

Calder's Geo is a sea cave located in the western cliffs of Esha Ness, with steep rock walls rising directly from the water. The interior extends deep into the cliff face, creating a massive natural chamber that opens onto the North Sea.

This cave was thoroughly surveyed by geologist Jonathan Swale in recent years, fundamentally changing how we understand Britain's largest natural chambers. The discovery led to previous records about such formations being reassessed and updated.

Local maritime traditions and geological research activities regularly bring scientists and explorers to document the features of this natural formation.

Visiting requires kayaking equipment and stable weather, since the opening leads directly onto open water. It is important to check local conditions before making the trip.

The cave interior spans approximately 5,600 square meters, making it larger than the Frozen Deep chamber in Somerset's Cheddar Gorge.

Location: Shetland Islands

GPS coordinates: 60.49088,-1.62462

Latest update: December 13, 2025 12:23