A small fishing hamlet, with a hotel, in the Assynt area of northwest Sutherland, Kylesku is located where Loch Glencoul and Loch Glendhu join to form a narrow passage that leads into Eddrachillis Bay via Loch a' Chairn Bhain. The Kylesku narrows, formerly crossed by a ferry, are now traversed by a curving five-span bridge opened in 1984. The Kylesku Hotel began as a coaching inn in 1680 and overlooks the junction between Lochs Glendhu and Glencoul. Boats from Kylesku travel these lochs, on the latter visiting Britain's highest waterfall, Eas a' Chuail Aluinn (201m / 658 feet).
The settlement of Kylestrome lies to the north.