Seleucus is a lunar impact crater

Impact crater

In the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body...

 located in the western part of Oceanus Procellarum

Oceanus Procellarum

Oceanus Procellarum is a vast lunar mare on the western edge of the near side of the Earth's Moon. Its name derives from the old superstition that its appearance during the second quarter heralded bad weather...

. To the west is the lava

Lava

Lava refers both to molten rock expelled by a volcano during an eruption and the resulting rock after solidification and cooling. This molten rock is formed in the interior of some planets, including Earth, and some of their satellites. When first erupted from a volcanic vent, lava is a liquid at...

-flooded remains of the walled plain Eddington

Eddington (crater)

Eddington is the lava-flooded remnant of a lunar impact crater, located on the western part of Oceanus Procellarum. The western rim is attached to the wall of the walled plain Struve. To the east-southeast is the smaller but prominent crater Seleucus...

. To the southwest is the crater Krafft

Krafft (crater)

Krafft is a prominent lunar impact crater located near the western edge of the Oceanus Procellarum. To the north is the lava-flooded walled plain Eddington. Almost due south is the crater Cardanus, and the two are connected by a 60-kilometer-long chain of craters known as the Catena Krafft.Krafft...

 and to the northwest lies Briggs

Briggs (crater)

Briggs is a lunar crater that is located in the western part of the Oceanus Procellarum, to the east of the large walled plain Struve. It lies to the northeast of the walled plain Eddington, and north-northwest of the crater Seleucus. The isolated position of this crater on the mare, near the...

.

The rim of Seleucus is well-formed, with a terraced inner rim and a slight rampart. The floor is relatively flat, with a small central peak. A bright ray

Ray system

A ray system comprises radial streaks of fine ejecta thrown out during the formation of an impact crater, looking a bit like many thin spokes coming from the hub of a wheel. The rays can extend for lengths up to several times the diameter of their originating crater, and are often accompanied by...

 from Olbers

Olbers (crater)

Olbers is a lunar crater that lies at the west edge of the Oceanus Procellarum, near the western limb of the Moon. It lies to the northwest of the crater Hevelius, and to the north of the indistinct Hedin. Farther to the south is the crater Riccioli. Due to its location, this crater appears very...

 grazes the southeastern rim of Seleucus, following a line to the northeast.

Approximately 50 kilometers to the southeast of Seleucus, on the Oceanus Procellarum, is the landing site of the Soviet

Soviet Union

The Soviet Union , officially the Union of Soviet Socialist Republics , was a constitutionally socialist state that existed in Eurasia between 1922 and 1991....

 landing craft Luna 13

Luna 13

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Satellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Seleucus.

Seleucus	Latitude	Longitude	Diameter
A	22.0° N	60.5° W	6 km
E	22.4° N	63.9° W	4 km