Located on the Moon
's southern hemisphere, Mare Ingenii
("sea of cleverness") is one of the few lunar mare
features on the far side of the Moon. The mare sits in the Ingenii basin. This basin material is of the Pre-Nectarian
epoch. The mare material located in Ingenii and the surrounding craters is of the Upper Imbrian
epoch. The dark circular feature which dominates this mare is the Thompson crater (112 km diameter), with the overflow from Ingenii/Thompson directly to the east. Mare Ingenii is incompletely and thinly covered over much of its expanse with mare lava sheets. The best flooding conveniently occurs in Thomson crater in the ENE part of the Mare Ingenii basin. The light gray crater to the south of ingenii is Obruchev.