Picard 14.6°N, 54.7°E

Peirce 18.3°N, 53.5°E

Picard and Pierce, with diameters of 22 km and 18 km, respectively, are the only notable craters on the floor of Mare Crisium. Both exhibit sharply defined crater walls and are certainly relatively young when compared with the craters in the southern highlands. Picard is one of the few double-walled craters, that may be observed with small telescopes.

O'Neill's Bridge 15.2°N, 49.2°E

O'Neill's Bridge is not an official lunar designation, but a sort of nickname, first introduced by the amateur John O'Neill in 1953. The supposed bridge is visible shortly after Full Moon, when the terminator reaches the western edge of Mare Crisium. When seeing conditions are relatively poor (or the telescope's aperture is too small), the object resembles a bridge, joining the tips of the capes Promontorium Lavinium and Promontorium Olivium. (Neither designation is used officially nowadays.) If the seeing conditions are good and the instrument large enough, two small, eroded crater pits are revealed at the site. O'Neill's Bridge lies directly southeast of the crater Proclus.

Lick 12.4°N, 54.7°E

Yerkes 4.6°N, 51.7°E

Two, structurally almost identical, lava-flooded craters lie southeast and east of O'Neill's Bridge. Lick has a diameter of 31 km, and Yerkes is somewhat larger at 36 km. North of it lies Yerkes E (10 km), which is linked to Yerkes by a ridge.