Cleomedes (76 miles wide) has highs walls that rise to over 2½ miles in places. The floor is flat and lava filled. There is a small off-center peak that is less than 1 mile high. There are two craters on the floor that are easy to see even in small instruments. While not visible on the photo image there is a cleft on the northern floor that is relatively easy in my 4 inch refractor under grazing sunlight and very easy in the 6 inch. Look for this fascinating formation 3 days after new Moon.
Thalles (27 miles wide) is a crater intruding onto the northwest rim of Cleomedes. Its steep walls rise to almost 2 miles above the floor. There is no central peak, but the floor is rough and has several hills scattered about. It is worth your time to investigate this formation.