Rima Ariadaeus is a linear rille on the Moon at 6°24′N 14°00′E / 6.4°N 14.0°E. It is named after the crater Ariadaeus, which marks its eastern end. Over 300 kilometers long, it is thought to have been formed when a section of the Moon's crust sank down between two parallel fault lines (making it a graben or fault trough). It is a relatively young lunar feature, with few craters or other features overlying it. The west end intersects with Rima Hyginus.