Sirsalis is a relatively young lunar impact crater located near the western lunar limb, to the southwest of the Oceanus Procellarum. The crater lies across a ridge that runs in a north–south direction. It has a sharp edge and a low central peak. The crater overlaps the slightly larger and older Sirsalis A to the west-southwest, and the two form a distinctive feature.
To the east is a rille system named the Rimae Sirsalis. The longest of these rilles follows a line running approximately north-northeast to south-southwest, just clearing the southeastern rim of Sirsalis by about 10 kilometers. This long rille runs 330 kilometers from the shore of Oceanus Procellarum until it crosses the crater Darwin A and intersects the Rimae Darwin to the east of Darwin.
Satellite craters By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Sirsalis.
Sirsalis LatitudeLongitudeDiameterA12.7° S61.3° W49 kmB11.1° S63.7° W16 kmC10.3° S63.8° W22 kmD9.9° S58.6° W35 kmE8.1° S56.5° W72 kmF13.5° S60.1° W13 kmG13.7° S61.7° W30 kmH14.0° S62.4° W26 kmJ13.4° S59.8° W12 kmK10.4° S57.3° W7 kmT9.2° S53.4° W16 kmZ10.7° S61.9° W91 km
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