Inner Sound, Scotland
The Inner Sound 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. An area, over long and up to wide, exists below a depth of, with a relatively flat bottom. There is another cleft 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°.
The Inner Sound is the location of BUTEC, a Royal Navy submarine sensor and emissions range.