Geological Chronicle
Rimae Sirsalis is a lunar rille measuring 405 kilometers in length. The trough was formed by extension of the surface, possibly due to dike propagation in the subsurface.
The rille cuts across highlands almost exclusively, beginning at the edge of Oceanus Procellarum near crater Sirsalis, from which it gets its name. Proceeding away from the mare, it passes through craters, ranges of hills, and small rilles before ending among the cracks in the floor of crater Darwin.
Rimae Sirsalis is also the site of a lunar swirl pattern and an associated magnetic anomaly.