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Rima Ariadaeus is a linear rille on the Moon at . 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.
- "Rima Ariadaeus, a Linear Rille". NASA. Retrieved 8 June 2016.
Experts agree that Rima Ariadaeus, about 300 km (186.4 mi) long, is a fault system similar to those on Earth.