King's Trough King's Trough King's Trough is an undersea trough in the Atlantic Ocean. It is located on the east side of the Mid-Atlantic Ridge, northwest of the Açores-Biscay rise and roughly 400 km NNE of the Azores. It is about 400 km long, running in a NW–SE direction. To the east it branches into the Peake Deep and Freen Deep. The center depth is 4500 m. Surrounding the trough are high ridges and seamounts, such as the Antialtair seamount and the Crum seamount complex. Various explanations for the complex have been suggested, ranging from compression a former plate-boundary, transform faulting or
Rockall sovereignty for itself. The consistent position of successive Irish Governments has been that Rockall and similar rocks and skerries have no significance for establishing legal claims to mineral rights in the adjacent seabed or to fishing rights in the surrounding seas." The origin and meaning of the islet's name "Rockall" is uncertain; the Old Norse name for the islet, "Ròcal", may contain the element "fjall", meaning "mountain". It has also been suggested that the name is from the Norse "*rok", meaning "foaming sea", and "kollr", meaning "bald head"—a word which appears in other placenames in Scandinavian-speaking areas. Another idea is