Struve is the lava-flooded remains of a lunar impact crater. It is located near the western extreme of the Oceanus Procellarum, close to the western lunar limb. As a consequence, even though it is roughly circular in outline, it appears oval due to foreshortening. The northern rim of this crater intersects the smaller lava-flooded crater Russell to the north, and there is now a wide gap between the two formations. (wikipedia entry)