Inner Sound, Scotland

The Inner Sound (Scottish Gaelic: An Lighe Rathairseach) is a strait separating the Inner Hebridean islands of Skye, Raasay and South Rona from the Applecross peninsula on the Scottish mainland.

The Inner Sound includes the deepest section of the UK's territorial waters, with a maximum depth of 1,062 feet.[1] An area, over 1.5 miles (2.4 km) long and up to 0.25 miles (0.40 km) wide, exists below a depth of 960 feet (290 m), with a relatively flat bottom. There is another cleft 828 feet (252 m) deep, separated from the deeper bowl by an area of shallower water.[1] A dive to examine the deeper trench found the bottom to be made up of bioturbated mud, with a steep slope towards the west of up to 60°.[2]

The Inner Sound is the location of BUTEC, a Royal Navy submarine sensor and emissions range.


  1. Robinson, A. H. W. (1949). "Deep clefts in the inner sound of Raasay". Scottish Geographical Magazine. 65: 20–25. doi:10.1080/00369224908735399.
  2. Geyer, R.A. (2011). Submersibles and Their Use in Oceanography and Ocean Engineering. Elsevier. p. 263. ISBN 9780080870533.

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