Langness (Manx: Langlish) is a peninsula which protrudes two kilometres at the southern extremity of the Isle of Man. Signifying a cape or extended promontory, Langness literally means "long promontory" in Old Norse. Formerly an island, Langness was eventually joined to the mainland by the movement and deposition of material along Castletown Bay to form a tombolo. The small community of Derbyhaven is situated on the east coast of this isthmus, which lies close to Castletown, Isle of Man.