Sirsalis est un cratère de 41 km relativement jeune situé près du limbe lunaire occidental, au Sud-ouest d'Oceanus Procellarum (l’Océan des tempêtes). Sirsalis a des versants escarpés et une crête centrale. Le cratère recouvre un cratère légèrement plus grand et plus ancien Sirsalis A. À l'est on trouve un système de rainures appelées Rimae Sirsalis.

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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 a slightly larger and older crater '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-soutwest, just clearing the southeastern rim of Sirsalis crater 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 crater.