Casatus cratère de 111 Km et profond de 3900 m nous apparaît sous une perspective fuyante formant un cratère double avec Klaproth (119 Km, 4300 m). Situé près de la région polaire australe riche en cratères divers, Casatus à des murailles peu érodées si ce n’est sur le coté ouest portant Casatus A. et au sud Casatus J. Le fond est plat, envahie par la lave d’où émerge, vers le nord, Casatus C un cratère bien dessiné. Klaproth à des versants peu escarpés portant  Klaproth  A  au  Nord,  Casatus H au Sud-ouest et Klaproth G & H à l'Ouest. Le fond très plat, aussi envahie par la lave, révèle la présence de Craterlets.

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Casatus is a lunar impact crater that is located near the southern limb of the Moon. The north-northeast rim of the crater is overlaying a portion of the slightly larger Klaproth crater. Along the western rim, 'Casatus A' is intruding somewhat into the interior, producing an inward-bowing rim. To the southeast of Casatus is Newton crater.

The outer rim of Casatus is old and worn, with many tiny impacts along the rim and inner wall. The small satellite crater 'Casatus J' lies across the south-southeastern rim. The height of the rim is lower where it divides this crater from Klaproth, forming a rounded ridge.

The interior floor has been resurfaced by ancient lava flows, leaving a level surface marked by several tiny ghost-crater rims projecting above the surface and a pair of clefts in the southern part of the floor. A small, bowl-shaped impact crater forms a prominent feature in the northern half of the floor. There is no central peak formation at or near the mid-point of the interior.