Sulcus (plural: sulci ) is, in

astrogeology Planetary geology, alternatively known as astrogeology or exogeology, is a planetary science discipline concerned with the geology of the celestial bodies such as the planets and their moons, asteroids, comets, and meteorites. Although the geo ...

, an area of complex parallel or subparallel ridges and furrows on a planet or moon. For example, Uruk Sulcus is a bright region of grooved terrain adjacent to

Galileo Regio Galileo Regio is a large, dark surface feature on Jupiter's moon Ganymede. It is a region of ancient dark material that has been broken apart by tectonism and is now surrounded by younger, brighter material (such as that of Uruk Sulcus) that ha ...

Jupiter Jupiter is the fifth planet from the Sun and the List of Solar System objects by size, largest in the Solar System. It is a gas giant with a mass more than two and a half times that of all the other planets in the Solar System combined, but ...

's moon Ganymede.

References

Planetary geology {{geology-stub