The Drongs is a series of thin, granite pinnacles. They include a 30m-high rock pillar known prosaically by climbers as Slender Drong, the 60m high Main Drong and the two smaller stacks, Slim Drong and Stumpy Drong, both 15m high. A team consisting of Mick Fowler, Andy Nisbet, Jon Lincoln and Craig Jones climbed all four in a seven day period in 1992. All four stacks are rated as severe to hard very severe.

David Henry Parry (1793-1826) drew The Drongs for Samuel Hibbert's "Description of the Shetland Islands' published 1822.

The Drongs in 1980 (Shetland Museum)

The Drongs, Hillswick - Streetmap extract

Stacks

Definition: pillar-like eroded remnant of a coastal cliff, with margins often defined by major fractures. Stac Gaelic - a rock pillar

Stacks can be formed by loss of the keystone of an arch in response to marine erosion. Stacks can also develop directly from erosion the cliff face or headland where the overlying rock is not strong enough to form a supporting roof.

Stacks may form relatively rapidly through selective erosion along weaknesses in otherwise resistant rock. Once isolated from a host cliff the stack can become a relatively persistent feature, although we know next to nothing about the survival time of stacks. The stacks may have few joints and erode more slowly in comparison with the retreating cliff. Secondary arches may develop within the stack where other fractures are exploited by marine processes. Eventually the stack will collapse leaving a stack remnant or stump.

arches   caves   cliffs   cliff top storm deposits   geos   gloups   headlands