Thebit est un cratère de 57 Km et profond de 3270 m) situé sur le rivage Sud-est de la Mer des Nuées (Mare Nubium). Thebit est situé au Sud-ouest du cratère Arzachel (97 Km, 3610 m) et Nord-ouest de Purbach (118 Km, 2980 m). Un cratère Thebit A (20 Km), se trouve sur le mur ouest. Le mur ouest de ce dernier est recouvert aussi par un cratère plus petit Thebit L (12 Km). Le plancher de Thebit est tourmenté avec des lignes de crêtes. La muraille montre une terrasse à l’intérieur, et un haut rempart externe accidenté. Au Sud-ouest de Thebit se trouve un ancien cratère anonyme duquel part Rupes Recta.

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Thebit is a lunar impact crater located on the southeast shore of Mare Nubium. To the north-northwest is Arzachel crater, and Purbach crater lies to the south-southwest. To the southwest is the flooded remnants of Thebit P, which is actually larger in diameter than Thebit crater.
The rim of Thebit crater is generally circular in outline, with a double-notch in the southwest wall. A prominent bowl-shaped crater, Thebit A, lies across the west-northwestern rim. The west-northwestern rim of this crater is overlain in turn by the even smaller Thebit L. Together this forms an elegant arrangement that makes Thebit relatively simple to identify. The floor of Thebit crater is rough floor and has no central peak. The rim displays a terrace, and has a hilly outer rampart.
Due west of Thebit crater is a 110-kilometer-long ridge named Rupes Recta, which rises as high as 240 meters. This linear feature runs north-northwest to south-southeast across the Mare Nubium.