Dorsum Cayeux

{{Short description|Wrinkle ridge on the Moon}}

Image:Dorsum Cayeux AS11-42-6224.jpg, with Taruntius P and K in lower left]]

Dorsum Cayeux is a wrinkle ridge at {{Lunar coords and quad cat|1.6|N|51.2|E|globe=Moon}} in Mare Fecunditatis on the Moon. It is approximately 95 km long and was named after French geologist Lucien Cayeux in 1976 by the IAU.[https://planetarynames.wr.usgs.gov/Feature/1609 Dorsum Cayeux], Gazetteer of Planetary Nomenclature, International Astronomical Union (IAU) Working Group for Planetary System Nomenclature (WGPSN)

Dorsum Cayeux begins on the north side of Taruntius P crater and trends to the northwest past Taruntius K crater, and then it curves back to the northeast and flattens out into the mare surface northwest of Smithson crater. The ridge is probably a continuation of Dorsa Geikie, which ends on the south side of Taruntius P crater (i.e., the object that created Taruntius P impacted the ridge).