Inner Sound, Scotland
The Inner Sound includes the deepest section of the UK's territorial waters, with a maximum depth of 1,062 feet. 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. 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°.
- Robinson, A. H. W. (1949). "Deep clefts in the inner sound of Raasay". Scottish Geographical Magazine. 65: 20–25. doi:10.1080/00369224908735399.
- Geyer, R.A. (2011). Submersibles and Their Use in Oceanography and Ocean Engineering. Elsevier. p. 263. ISBN 9780080870533.